You either believe in individual liberty or you don't. That's the bottom line.
We all know pot makes you paranoid.
Pot smokers don't know that. At least none that I've ever met. Teenagers who are engaged in breaking laws get paranoid I am sure.
We know the usual effects of all the recreational drugs. They aren’t hard to figure out.
Such as the very common aggressiveness and violence exhibited by consumers of alcohol. It doesn't seem to be too much of a problem to deal with that through appropriate criminal sanctions on assault and battery and civil remedies for property damage though. Of course we could apply your paranoid and irrational standard of justice to those problems as well and go back to alcohol prohibition. It was emotionally satisfying to its supporters back in the day too.
It’s really not the consumers of alcohol (one can have a drink or two) but the drunken.
Yes, I do believe in individual liberty. I have the liberty to be in my house and not be assaulted by a person who has deliberately made himself delusional by smoking pot.
I am no geneticist but have a good friend who specializes in drug-induced psychosis, especially schizophrenia, heading up major studies in that area. He has opened my eyes to the fact that many mentally ill people are that way due to previous drug abuse. A famous person you may relate to in that way would be Roger Waters, of Pink Floyd, who lost his mind to LSD. He is famous, but there are of course many more non-famous as well.
Secondarily, a large number (I won’t pretend to remember how many) with mental illnesses were RAISED by drug abusers, who either abused or neglected them, or both. Due to their drug abuse. Which makes you far more abusive and neglectful than you would normally be.
Thus, while I am all for individual liberty, I do not consider drug abuse to be an individual liberty.
Smoking cigs? Individual liberty. (I don’t smoke or drink, so I have no horse in this race). The second hand smoke arguments are absurd. The automatic snuff in cigs nowadays prevents the fall-asleep fires. So I see cigarette smoking as an individual liberty.
Likewise alcohol use, up to but not crossing the line of drunkenness. Same reason - I see no evidence that it’s harmful to anyone else.