joypopper

joy·pop

 (joi′pŏp′)
intr.v. joy·popped, joy·pop·ping, joy·pops Slang
To use a narcotic drug, especially heroin, occasionally without becoming addicted.

joy′pop′per n.

joypopper

(ˈdʒɔɪˌpɒpə)
n
a person who takes addictive drugs occasionally without becoming addicted