For me, THC is more problematic than alcohol. Obv, both are problematic in excess, but I've never really been "just a little high," aside from very small doses of gummies, but tolerance builds. I don't like the person I am when I'm high a lot of the time. Don't like the things I do. I get anxious, paranoid, and really can't function. Knowing this would usually only smoke or use edibles after my day was done, but became dependent on it despite the problems.
Would usually do one or the other, rarely both.
I find alcohol more manageable and enjoyable, and after kicking the daily weed habit don't have the desire to self medicate with booze as much either.
I'll go long stretches just normal sober now without a second though, drink socially and reasonably, and then do it again.
If I could kick one thing forever, it would be nicotine, but it's just so easy to fall back into. At least there are healthy alternatives to tobacco (nicotine pouches, swedish snus kind of), and there are benefits to nicotine (focus, alertness, calmness), but I'd rather not be addicted or dependent. Nicotine is weird. The withdrawal symptoms for me are like a light-headed fogginess, then when I start to think about the nicotine relief the urge becomes really strong. It's just so easy to obtain and use.
Coffee is another, I was drinking multiple energy drinks a day for awhile. Cut it back to zero for a week a few months ago, and suffered withdrawal headaches. I'm drinking coffee again, but limit myself to two cups in the morning. Would like to just live totally sober for a stretch and allow my body to adjust, see what that is like; just life without mind-altering substances altogether.
I'm rambling.