My somewhat professional opinion is that smoking MJ is equally or even less dangerous than smoking tobacco.
I have yet to hear a con that doesn't apply to alcohol and/or tobacco as well. That leads me to believe [conspiracy mode activated] the one reason why it's not legal is because of the tobacco lobby. Actually, forget the conspiracy mode, it's basically common knowledge.
Rookie Hammer Squad 2015
Frankie Edgar - Dominick Cruz - Jorge Masvidal - Cat Zingano - Holly Holm