I have known alcoholics and heavy marijuana users. Alcohol is hands down far worse for health long term if used heavily and regularly. It’s not even close. I personally consider alcohol a “hard drug” at least at higher doses.

That being said there is this myth that weed is harmless. It’s not. It’s a drug. If it’s smoked it damages the lungs just like smoking anything else, and the compounds in it might have negative long term effects on cognition.

Like anything else of the sort if it’s used at all it should be used in moderation.