Across the country, efforts to make marijuana more accessible have quickly gained traction. Medical marijuana is now legal in 23 states, and recreational use is also legal in four states and the District of Columbia.
Science, however, hasn't quite caught up. Largely due to its illegal status, there's been very little research done on marijuana's health effects. And researchers don't fully understand how pot affects the developing teenage brain.
This may explain the why the nation's pediatricians have changed their recommendations on marijuana and children.