Exactly! People have been drinking for millenia, and while alcohol doesn't make you healthier, it's also clear that drinking "normally" doesn't cause major health issues (unlike, smoking cigarettes for example). Sure, if you drink 2 bottles of wine a day, you're going to have a problem. Not so much with 2 glasses of wine a day.
THC, microdosing and all that other stuff is relatively new and the long-term effecs are not well researched. Shorter term, it's clear that THC can cause issues like schizophrenia, especially with teenagers. I would expect much more long-term negative effects of mind altering drugs, just because they fuck with your brain.