I didn't know anyone at that time doing cocaine, it was all about the rave scene and X, Special K, crank crystal meth. Will and all would know some tweekers, but it wouldn't be their friends and they'd know people doing X on the weekends because a lot of the 'good' kids were into raves and saw X as pretty harmless. Crystal Method was a hot local band in that era and Tweekend, one of their albums, was being developed at that time.
LSD tabs were floating around too. Roofies were not as big as X in the rave scene, but still around and aderall was abused by a lot of people, especially those trying to get into Harvard, Yale, etc.