We've had data from German studies, I posted on here before, that accounts for alcohol use that shows that people who smoke MJ before their brain is fully developed have a 70% chance of having some type of mental illness in their life time, and those studies have control groups etc.. plus those studies are decades old and peer reviewed heavily. We are now finally catching up in some science.
Again I have no issue with it being legal, I just like to point out MJ is not benign or has any health benefits outside of covering up symptoms. It's laughable at the links people will go to in order to Make Weed some Miracle cure that is perfectly safe and healthy. It is as bad or worse than cigarettes on the lungs not to mention the damage it does to the ole Grey matter.
The American Lung Association is concerned about the health impacts of marijuana use, especially on lung health. We caution the public against smoking marijuana because of the risk of damage to the lungs.
www.lung.org
Strangely many Left handed cig. promoters are anti-Tobacco... plus they are often pro Vapes and those Chemicals are very possibly the worse. The Myths people will spin to justify their High is amazing.