I used to do drugs in high school. I've been living in L. A. for almost 10 years, and shortly after I arrived I cleaned up pretty much. Stuff goes on on the set, stuff goes on at parties.
I'm a trained actor and I can always tone it down, I can always simplify the work I've done. But if I'm asked to bring the nuanced and complicated work, I'll have it in my pocket, and all that information helps.