The "Committe Conclusions" (http://nationalacademies.org/hmd/~/media/Files/Report%20Files/2017/Cannabis-Health-Effects/Cannabis-conclusions.pdf http://nationala

The "Committe Conclusions" (http://nationalacademies.org/hmd/~/media/Files/Report%20Files/2017/Cannabis-Health-Effects/Cannabis-conclusions.pdf http://nationalacademies.org/hmd/~/media/Files/Report%20File...) puts it like this: There is moderate evidence of a statistical association between cannabis use and: • Increased risk of overdose injuries, including respiratory distress, among pediatric populations in U.S. states where cannabis is legal (9-4b) There is no or insufficient evidence to support or refute a statistical association between cannabis use and: [...] • Death due to cannabis overdose (9-4a) I guess the full report goes into more detail on "overdose injuries, including respiratory distress".