Lady Gaga

The ‘Poker Face’ hitmaker became dependent on marijuana and used the substance as "a form of self-medication".

Gaga told the Elvis Duran radio show in 2016: "I was addicted to it... Although I think it's the best drug to choose from when you're playing around and experimenting, I just want young kids to know that you actually can become addicted to it, and it's ultimately... a form of self-medication."