With the legalization of cannabis comes a host of new concerns.
Both legal and public opinion of cannabis is changing in America.
Today, in Alaska, Colorado, Oregon and Washington, the possession and sale of cannabis for medicinal and non-medicinal purposes is legal.
Alongside these four states, another 15 are considering legalizing recreational cannabis use.
Washington, DC, legalized the personal use (but not commercial sale) of cannabis in 2015.
And a national survey conducted in 2013 found that 52% of Americans thought marijuana should be made legal.
As the law steadily softens across the country, research into the long-term effects of cannabis is more important than ever.
Cannabis research on the rise
There are few areas of medical investigation as controversial as cannabis
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