well...i might have to think about this some more, but my DOC has changed a few times in my drug-using 'career'.
i started out as a teenage stoner. never really dug alcohol - weed was probably easier to obtain, unless you count raiding your parents' liquor cabinet (which meant secretive drinking - not exactly a recipe for a good time). i loved LSD the few times i tried in in my mid-teens, but i found it hard to obtain.
in my late teens/early 20s i discovered meth. as i was now of drinking age (but not really a natural drinker - i realised what it was good for once i could go out and drink socially) i found meth gave me social confidence, allowed me to stay out late without fatigue, allowed me to drink more without getting too hammered, and it was done socially in my group of friends. my taste for it also coincided with my being able to afford to buy it, whereas previously i'd been an unemployed student.
around this time,weed pretty much lost its appeal, and i almost completely stopped smoking it.
as i used more methamphetamine, i realised some of the bad side effects. i saw many friends slide into insanity or at least different, fucked up personalities. the craziness and destructiveness of meth became something i'd witnessed personally rather than something i'd just read about.
as i tried to decrease my use of speed, i realised it was kinda hard. i kept using more frequently and for longer than i wanted to, and found it hard not to do every weekend. eventually i knew i had to quit, and i did.
so, anyway, around this time i found a good reliable LSD connection for the first time.
taking acid a couple of times a month (well...more like a couple of times a week for a while there) allowed me to get completely out of the fiendish speedfreak mindset i'd been locked into. acid helped me get off speed with very little effort.
once i was in a trippy psychedelic headspace, the meth rushes and neurotic busyness of amphetamine seemed a bit dirty, a bit sick.
so i started smoking weed again, and taking acid regularly.
i was in a really fucked up relationship at this stage - living with a girl i knew i didn't love, not really sure how to get out of the situation.
we were taking LSD a lot, and i continued doing something that i'd discovered in my meth-taking days; that opiates were the perfect way to cushion a come-down.
anyway, so after a year or so of heavy tripping (i just wanted to go higher and higher) of taking lots of acid and mushrooms and DMT, i found myself taking opiates after every trip. and before a trip (to calm my stomach) and and the end of a trip (to come down gently).
then i found myself taking opiates every day.
then i found i had a new drug of choice.
in contrast with amphetamines and LSD, and even marijuana to some extent, i found opiates really comforting. this comfort was like the polar opposite of the edginess of speed and acid, and after doing both of these so extensively it was like having some respite. some respite that wasn't sobriety, hahaha.
the main sources of opiates for me were/are legal or semi-legal ones. poppy pods, poppy seeds and codeine. these don't rely on drug dealers or knowing other drug users. they don't have the inflated prices of illicit drugs, and supply issues are very rare. i've grown my own pods, bought the others "for my wisdom teeth" (painkillers) or "for...baking" (poppy seeds). no hassles with ego-maniac sleazebag speed dealers or holier-than-thou hippie-elitist acid heads.
it's not ideal being chained to this addiction (at the risk of physical withdrawal) but it's a lot more convenient in many ways than any other drug i've seriously played with. i don't miss days of work from being hung-over, busted-up or sick, i don't (think) i look obviously stoned to co-workers and i'm a productive member of society (when i want to be hehehe). i put a lot of work into my art, and i don't have periods of massive confusion or psychotic breakdowns.
while my drug of choice has gone beyond being a simple "choice" to something of a way of life, i still get a hell of a lot of pleasure out of it, and i feel like i'm in a much healthier place psychologically, emotionally and physically than when i was having all-nighters shooting speed or going tripping 5+ times a month. i still love acid and take dexies every so often, but it's more like a holiday than a way of living.
so...i guess the point of this rambling anecdote is say that there is a grain of truth to the idea that drug of choice can be an externally-imposed thing. methamphetamine happened to be everywhere when i was at the age when i and everyone i knew was going out a lot (2003/4) and i sort of fell into it - even though i was quite well informed about how dangerous it was.
i don't blame acid (or speed) for leading me to getting an opiate habit, but there was a strange domino-like pattern to my history of use. some of the drugs i chose to use were (as far as i can tell) strictly by 'preference' - that is, i always have loved LSD - but there are also questions of availability or cost.
obtaining some drugs can rely on having social contacts in certain circles, and i don't think i'd know where to score meth today even if i wanted it. as far as i know, none of my friends take it any more.
on the other hand, i have a few different LSD sources, but when i was 18 or 19 i didn't have any. there are other drugs i'd love to take that i don't very often because i don't have a source at the moment, like DMT.
i think that if i'd had an acid connection in the first place,i might never have gotten so heavily into speed...but then again, i could be wrong. i think there definitely is an element of chance - but sometimes we make our own luck.
i don't really fit in well with the drinking crowd. the people i hang out with aren't really bothered that i don't drink, and it's the sort of people i've gravitated towards. we might not make friends with the intention of getting access to certain drugs (well, maybe sometimes!) but we do tend to be drawn to people with similar interests.
anyway....another really interesting thread! be interested to see what other folks have to say