Personally, I have no problems with people using the 'lighter' drugs: Weed, E, Codeine, NOS/BZP etc and used to be a fairly regular user myself. As many posters have said before me, it's your body. Certain hallucinogens (primarily LSD/Shrooms, as I have little experience with others) I'm ok with, but in controlled circumstances. Other than that, I can't comment on hard drugs (having never tried them myself), but certain things like PCP/Crystal Meth seem a bad idea.