I did quite a few drugs in high school (1996-1998 mainly) and was thin all throughout because I exercised obsessively to stay that way..(swim team, biked everywhere, locked myself in my room to do aerobics..)

I find that now its hard for me to speed up my metabolism.. I have to REALLY FREAKIN TRY to lose weight.. sigh..

List of drugs used... wow, havent talked about this openly in a LONG time..
Acid (LSD)
Speed (various forms, mostly just ephedrine/psuedoephedrine...)

Ecstacy only a couple times, hated it..
I never smoked cigarettes, and I hated pot.. tried Coke once, hated it..
I only preferred uppers, things that made me hyper and happy.. (and things that obviously sped up my metabolism rapidly..)shrug.. I quit everything cold turkey with I turned 18 pretty much...

Go figure, now Im all settled down, have a house, and am graduating college in December.. so.. I was a smart drug user I guess.. heh.. Nobody would ever know my past by talking with or looking at me...

but I do believe that my freak diets, fasting, crazy exercise, use of ephedrine and LSD all had something to do with my metabolism not being as fast as it should be.. hope thats what you were looking for.. take care..