There appears to be a shift in the United States in favor of relaxing marijuana laws, a topic that has dipped in and out of the national conversation for decades. Public perceptions about pot have come a long way, from the dire warnings of "Reefer Madness" to growing acceptance of medical marijuana. 
Members of a crowd numbering tens of thousands smoke and listen to live music at the Denver 420 Rally on April 20, 2013. Annual festivals celebrating marijuana are held around the world on April 20, a counterculture holiday. 
A man smokes a joint during the official opening night of Club 64, a marijuana social club in Denver, on New Year's Eve 2012. Voters in Colorado and Washington state passed referendums to legalize recreational marijuana on November 6, 2012. 
People light up near the Space Needle in Seattle after the law legalizing the recreational use of marijuana went into effect in Washington on December 6, 2012. 
Nutrient products are placed on shelves in the weGrow marijuana cultivation supply store during its grand opening on March 30, 2012, in Washington, D.C. The store is a one-stop-shop for supplies and training to grow plants indoors, except for the actual marijuana plants or seeds. Legislation was enacted in 2010 authorizing the establishment of regulated medical marijuana dispensaries in the nation's capital. 
Marijuana activist Steve DeAngelo wears a "Yes on Prop 19" button as he speaks during a news conference in Oakland, California, on October 12, 2010, to bring attention to the state measure to legalize marijuana for recreational purposes in California. Voters rejected the proposal. 
Sonja Gibbins walks through her growing warehouse in Fort Collins, Colorado, on April 19, 2010. Since the state approved medical marijuana in 2000, Colorado has seen a boom in marijuana dispensaries, trade shows and related businesses. So far 20 states and the District of Columbia have made smoking marijuana for medical purposes legal. 
A patient prepares to smoke at home in Portland, Maine, on October 22, 2009, a decade after the state approved a medical marijuana referendum. 
Coffeeshop Blue Sky worker Jon Sarro, left, shows a customer different strains of medical marijuana on July 22, 2009, in Oakland, California. Voters in the city approved a measure during a vote-by-mail special election for a new tax on sales of medicinal marijuana at cannabis dispensaries. 
Medicinal marijuana patient Angel Raich wipes her eyes during a press conference on March 14, 2007, in Oakland, California. The 9th circuit U.S. Court of Appeals in San Francisco ruled that 41-year-old Raich, who used medicinal marijuana to curb pain from a brain tumor as well as other ailments, did not have the legal right to claim medical necessity to avoid the possibility of prosecution under federal drug laws. 
Different varieties of medical marijuana are seen at the Alternative Herbal Health Services cannabis dispensary in San Francisco on April 24, 2006. The Food and Drug Administration issued a controversial statement a week earlier rejecting the use of medical marijuana, declaring that there is no scientific evidence supporting use of the drug for medical treatment. 
People in New York gather for a pro-cannabis rally on May 4, 2002. That same day, almost 200 similar events took place around the world to advocate for marijuana legalization. It was dubbed the "Million Marijuana March." 
Dennis Peron takes notes during a phone interview while Gary Johnson lights up at the Proposition 215 headquarters in San Francisco on October 11, 1996. The ballot measure was approved when voters went to the polls in November, allowing medical marijuana in California. 
A television ad aired in 1996 by Republican presidential candidate Bob Dole's campaign included footage from a 1992 MTV interview of a laughing President Clinton saying he would inhale marijuana if given the chance to relive his college days. 
President George H. Bush holds up a copy of the National Drug Control Strategy during a meeting in the Oval Office on September 5, 1989. In a televised address to the nation, Bush asked Americans to join the war on drugs. 
Robert Randall smokes marijuana that was prescribed to treat his glaucoma in 1988. He became the first legal medical marijuana patient in modern America after winning a landmark case in 1976. 
First lady Nancy Reagan participates in a drug education class at Island Park Elementary School on Mercer Island, Washington, on February 14, 1984. She later recalled, "A little girl raised her hand and said, 'Mrs. Reagan, what do you do if somebody offers you drugs?' And I said, 'Well, you just say no.' And there it was born." She became known for her involvement in the "Just Say No" campaign. 
President Jimmy Carter, with his special assistant for health issues, Dr. Peter Bourne, beside him, talks to reporters at the White House about his drug abuse control message to Congress on August 2, 1977. Among other things, he called for the elimination of all federal criminal penalties for the possession of up to one ounce of marijuana. 
Panel members of the National Commission on Marijuana and Drug Abuse attend a hearing In Denver on January 10, 1972. From left, Dr. J. Thomas Ungerleider, psychiatrist; Michael R. Sonnenreich, commission executive director; Raymond P. Shafer, commission chairman; Mitchell Ware, Chicago attorney; Charles O. Galvin, Dallas law school dean. The commission's findings favored ending marijuana prohibition and adopting other methods to discourage use, but the Nixon administration refused to implement its recommendations. 
Protesters wade in the Reflecting Pool at the National Mall in Washington during the "Honor America Day Smoke-In" thrown by marijuana activists in response to the official "Honor America Day" rally organized by President Nixon supporters at the Lincoln Memorial on July 4, 1970. 
Marijuana reform was the Life magazine cover story in October 1969. The banner read: "At least 12 million Americans have now tried it. Are penalties too severe? Should it be legalized?" 
Police dogs trained to smell out hidden marijuana examine U.S. soldiers' luggage at the airport during the Vietnam War in 1969. Drug use was widespread during the war. 
People share a joint during a 1969 concert in Portland, Oregon. In 1973, Oregon became the first state to decriminalize cannabis. 
Marijuana use became more widespread in the 1960s, reflecting the rising counterculture movement. 
Research scientist Dr. Reese T. Jones, right, adjusts the electrodes monitoring a volunteer's brain response to sound during an experiment in 1969 that used a controlled dosage of marijuana. The tests were conducted at the Langley Porter Institute at the University of California, San Francisco. 
U.S. Customs agents track the nationwide marijuana market during Operation Intercept, an anti-drug measure announced by President Nixon in 1969. The initiative intended to keep Mexican marijuana from entering the United States. 
Members of the Grateful Dead talk with reporters from their home in San Francisco on October 5, 1967. The band was protesting being arrested for marijuana possession. 
A woman buys ready-rolled marijuana cigarettes from a dealer at her door circa 1955. 
Even after Congress cracked down on marijuana in 1937, farmers were encouraged to grow the crop for rope, sails and parachutes during World War II. The "Hemp for Victory" film was released in 1942 by the U.S. Department of Agriculture. 
Marijuana cigarettes are hidden in a book circa 1940. Congress passed the Marijuana Tax Act in 1937, effectively criminalizing the drug. 
A poster advertises the 1936 scare film "Reefer Madness," which described marijuana as a "violent narcotic" that first renders "sudden, violent, uncontrollable laughter" on its users before "dangerous hallucinations" and then "acts of shocking violence ... ending often in incurable insanity." 
Harry Anslinger was named commissioner of the Federal Bureau of Narcotics when it was established in 1930. While arguing for marijuana prohibition, he played on Americans' fear of crime and foreigners. He spun tales of people driven to insanity or murder after ingesting the drug and spoke of the 2 to 3 tons of grass being produced in Mexico. "This, the Mexicans make into cigarettes, which they sell at two for 25 cents, mostly to white high school students," Anslinger told Congress. 
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- Gov. Christie recommends two changes to bill before he signs it
- Bill would eliminate limit on strains that dispensaries can offer in New Jersey
- That could give patients access to useful types that otherwise wouldn't be available
- Bill also would make it simpler for children to qualify
Watch Dr. Sanjay Gupta's groundbreaking documentary "WEED" at 10 p.m. ET tonight on CNN.
(CNN) -- New Jersey Gov. Chris Christie on Friday said he'd accept a medical marijuana bill that would expand options for patients -- including allowing qualified children to consume edible forms -- but only if certain changes are made.
Christie told the Legislature that he would sign the bill if it stipulated that edible forms of marijuana would be dispensed only to minors, not to patients of all ages.
Another condition: Christie wants to delete a provision that would have let children qualify for the program with only a doctor's approval. Current law requires that children receive approval by at least a pediatrician and a psychiatrist.
The bill, S2842, would have added edible marijuana to the current dry-leaf and lozenge options for all qualified patients. Christie wants the bill to allow edible marijuana for qualified children only -- a move that would please parents concerned that the other options posed choking and other health concerns.
"Today, I am making commonsense recommendations to this legislation to ensure sick children receive the treatment their parents prefer, while maintaining appropriate safeguards," Christie said in a statement released Friday. "I am calling on the Legislature to reconvene quickly and address these issues so that children in need can get the treatment they need."
The bill also would eliminate a limit on the number of marijuana strains that the state's dispensaries can cultivate -- ostensibly making it more likely that they would carry versions that certain patients seek. Christie did not ask for changes to this provision.
Christie's decision came under pressure from an epileptic girl's father, who contends the bill would make it easier for her to get a version of the drug that might help her.
Brian Wilson's 2-year-old daughter, Vivian, suffers a version of epilepsy called Dravet syndrome. Normal epilepsy medications have so far failed to work for Vivian, and her family believes a certain type of medical marijuana -- one with high levels of cannabidiol, or CBD -- may be able to help. High-CBD strains of marijuana have helped other patients with Dravet Syndrome.
Vivian is cleared to receive medical marijuana, but the state's sole currently operating dispensary, limited by law to offering only three strains, does not offer the high-CBD marijuana her family seeks.
"It's a small victory but it's kind of ludicrous in some ways" Wilson told CNN's Jake Tapper after the decision was put forward Friday. "The psychiatrist is just a roadblock," he continued, arguing that many children in need of medical marijuana do not have psychological issues or are able to communicate with psychiatrists.
Trying to get an answer on the bill but unable to get a meeting with the governor, Wilson and members of his family on Wednesday crashed a small Christie campaign stop at a local diner in Scotch Plains. They beseeched the governor to sign the bill.
"I was wondering what the holdup was; it's been like two months now," Wilson said to Christie.
Christie responded that while the decision may be simple for Wilson, it's not as easy for the Republican governor. Christie is thought to be a major contender for his party's 2016 nomination for president.
Marijuana stops child's severe seizures
"These are complicated issues," Christie told Wilson. "I know you think it's simple and it's not."
Christie has in the past expressed trepidation about marijuana. "I am not going to turn New Jersey into Colorado and California. I'm not legalizing marijuana in New Jersey," he said in July.
As for children, Christie said he was "very reluctant."
In separate remarks, Christie said that for the medical marijuana bill, "I'm concerned about expanding the program and I want to make sure that if we do it we do it in a way that is helpful to children," he said.
Christie worried about going "down the slippery slope of broadening a program and making it easier to get marijuana that wouldn't necessarily go to other people."
Regardless of whether Christie signs the bill, it appears Vivian may soon have access to high-CBD marijuana. A dispensary expected to offer a high-CBD version is scheduled to open in New Jersey later this year, according to the New Jersey Department of Health.
Vivian's family also supported the bill because they prefer the edible form to lozenges -- which they say is a choking hazard and contains sugar, which is inadvisable for her condition -- and smoking.
The Wilson family and their supporters have a website called Letters for Vivian at which they urge people to write Christie and asked him to support the measure. The letter says that the type of medical marijuana they want for Vivian has no "high," with far less tetrahydrocannabinol, or THC, than in recreational marijuana. THC is the active ingredient that gets people high.
According to the letter, Vivian has been signed up for medical marijuana, but she "has not received any medication due to New Jersey's overreaching and unsafe restrictions" on the medical marijuana program.
Opinions on the use of marijuana, particularly for medical purposes, have shifted in the United States in recent years, with a growing chorus that it should be made available by prescription.
"As I have repeatedly noted, I believe that parents, and not government regulators, are best suited to decide how to care for their children," said Christie in his conditional approval of the bill on Friday. "Protection of our children remains my utmost concern, and my heart goes out to those children and their families who are suffering with serious illnesses."
Are American opinions on marijuana reaching tipping point?
CNN's Jason Hanna contributed to this report.
