After seven US states legalised recreational use of marijuana, teenagers reported less use of the drug in anonymous surveys, perhaps because legal dispensaries require proof of age
Source:
https://www.newscientist.com/article/2209053-us-teens-may-be-finding-it-harder-to-buy-cannabis-after-legalisation/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home