It used to so much more than today, even though I used less drugs back then. Basically, before I spent a good portion of all my free time simply trying to find the drugs I was so desperate to use (mostly cannabis, but other elusive exotics as well), so my social life revolved around trying to find weed hook-ups and then sitting out however many hours were left of the evening smoking the fruits of our labour.
Nowadays with weed and psilocybin truffles being no more difficult or risky to procure than tobacco or alcohol, my social life is already considerably liberated. I also get most of my drugs from a very reliable dealer so it's much less of an issue. Most - not all, and this is in contrast to Finland - of my friends do use illicit drugs, but I don't say that my social life revolves around them. Drugs are very much involved in my daily social life - using them with others, meeting and connecting with others through shared drug experiences, etc. - but I would not say that is the axis on which my social life revolves. I use drugs just as much, if not more, in my anti-social life, so it's not as much using drugs socially as it is using drugs and then socializing.
A little hard to explain the fine nuances, but before I clearly felt my life did revolve around drugs, whereas now it does not, and I am glad - I connect with these people on other points than just drugs, and by lucky coincidence, they happen to enjoy many of the same drugs I do and are not judgmental. The drugs are decisive in some ways, though; the kinds of parties I go to, music I enjoy, and general values I uphold are much better reflected in the drug community than the legal intoxicant junkies.