Isnt it possible that people smoking weed were treating conditions like anxiety or depression and are more likely to commit suicide in the first place? Weed has had a real deficit of actual study and although some people can get a dependency on it I have a hard time qualifying those people as addicts when stopping weed is so much less dangerous and difficult than other substances. Its a complicated topic that requires quite a lot of care when you talk about it, because labelling someone as an addict is a tall order and also weed has been a moral panic for so long.