Adrock started drinking a lot of coffee for a reason.
In my opinion, they never really sensationalized drugs though. At least not comparative to other acts. There's definitely crazy references to drug use but that's life, especially when you're in the music industry, especially in New York in the 80s (lots of dust, heroine, and cocaine) and in LA in the 90s.
Dave Scilken died of an overdose in 1991. I'm sure there were other casualties too. After the Ill Comm era you don't hear too much about drugs from them (except weed which, come on, is that really still considered a drug?) The last hard-drug reference I can think of is Four Fly Guys in 1994.