States that have legalized marijuana need to put strong restrictions on the drug’s edible products, according to two Stanford law professors.

In a new article in the New England Journal of Medicine, Robert MacCoun and Michelle Mello of Stanford Law School wrote that one of the most notable features of the rollout of state-legalized retail sales of marijuana has been the tremendous popularity of edible products.

The problem is that marijuana edibles – which often look like candy or cookies and are frequently potent – increase the chances that children will overdose, they wrote in the article. MacCoun studies social psychology, and Mello, health policy.

“As legalization of marijuana spreads, new adopters (states) should ensure that their regulatory scheme for marijuana edibles is fully baked,” wrote MacCoun and Mello. [Read more at Stanford News]