Did it? You're relying on surveys on people self-reporting illegal activity and comparing it to post-legalization data. There is a lot to think about in regards to these issues and I suggest you maybe read up on it some more if you are interested.

In the meantime, before legalization, weed only become stronger and more readily available. Many teenagers could get it more easily than booze. That was with the government at all levels doing everything it could to stop marijuana use. With many ruined lives of otherwise free people coming with those polices.