(The Atlantic) – Currently, recreational cannabis is legal for adults over the age of 21 in 24 states, which are home to more than half of the U.S. population. According to a recent Harris poll, about 40 percent of Americans use cannabis, and a quarter do so on at least a weekly basis. And yet, researchers and physicians told me, scientific consensus on the drug’s precise effects—especially on the heart and lungs, mental health, and developing adolescent brains—is still lacking. Rescheduling marijuana will broaden access further still, which makes finding better answers to those questions even more crucial. (Read More)