I never got into ciggaretes (I got nicotine thu snuff (that's powdered tobacco you snort in with your nose, chewing tobacco is "snus", it's different) but it was a short phrase like 5 years ago), the only drug I seriously got into was codeine obtained thru cough syrup
codeine is an opiate, like heroin or fentanyl, so the effects are similar (just way weaker, of course, but if you take enough or/and have low tolerance, it'll be enough to feel like in paradise): any little pains you may have disappear, your muscles relax, you experience the ultimate chill, euphoria, sleepiness (but it feels REALLY good), you feel internal warmth (it's so good, I describe it as feeling warmth in my bones, it's not simple external warmth) etc.
I used to take it, put on my comfiest clothes like a very soft hoodie (or go naked, that's also an option), get a bunch of pillows and lay on my bad, rolling around, cuddling the pillows, falling in and out of sleep, absolutely fantastic, feels like a cuddle session with a foid (well, at least that's how I imagine it) or sleeping on a cloud
unfortunately you get addicted very fast and the tolerance goes up very fast, so before you notice, you need to drink your entire town's supply of cough syrup just to feel anything and the effect slowly gets shittier and shittier
you regain tolerance by giving it a break, like for a month, but it's impossible to just limit yourself to one high per month once you're addicted (addiction depends heavily on your genes btw, so you may get lucky and not get that bad)
I didn't get too deep into addiction, I simply couldn't afford to drink it more often than twice a week (that's during the worst period), but at some point I decided to completely abstain from it cos it's costly and I want to be drug free
also, this half-asleep state kinda taught me how to meditate, so now I can kinda do the same cuddling pillow session but without the drug, it's not as good, of course, but I can clean my mind on demand and get pretty deep relaxation
I don't hide that I dream about giving in and having some all the time, you can see from my descriptions that I loved this shit, but I prefer to stay completely sober for now, maybe if I find a friend someday, we'll get some codeine and have a hardcore cuddle session