I'm who a user in favor of legalization.
And I agree it's "less bad" than being an alcoholic.
However, it's basic common sense to say that HABITUAL smoking is bad for your lungs-- much like cigarette smoke.
1) The smoke is usually held in the lungs longer to help get the desired effect
2) TAKE A LOOK AT THE RESIN IN YOUR BOWL...THAT is also the lining of your lungs if you do it all the time.
In rare cases, smoking daily for years CAN make you psychotic. Or at least contribute to/exacerbate the issue.
But direct causation is not proven, as there can be many other factors (other substances, pre-existing mental health condition, family history, lack of sleep, etc.),.
While not physical, It can be "psychologically" addictive...If it's your daily lifestyle and you are stuck in that pattern @
Objective