I pretty much grew up using LSD starting from the age of 14.
Smoked pot for 25 years. Played a little with coke, and any other hard drug. Never heroine, though, (not sure why).
Anyway...I woke one morning in my mid-twenties and simply didn't want to smoke pot anymore.
Started using meth in my late thirties and for about 10 years thereafter. Again, woke one morning not wanting the high anymore.
I consider myself very fortunate that I was able to quit so easily and without any relapses. I've never wanted to use since my last ...some ..10 or so years ago.
Shangrala