Nearly half the states, 23 states, and the District of Columbia allow medical marijuana. Voters in four states have legalized pot for recreation, and a majority of Americans favor legalization. Research about how marijuana affects our brains and bodies is an urgent issue. There is less hard science about marijuana than you might think. Hampton Sides is author of the National Geographic June cover story “Weed: The New Science of Marijuana.” He is an acclaimed journalist and the author of the bestselling non-fiction adventure stories Ghost Soldiers, Blood and Thunder, Hellhound On His Trail. His latest best-seller In the Kingdom of Ice, will be released in paperback by Anchor Books (2015) this month.
All images are from the June issue of National Geographic magazine.