It well known that Lady Gaga is a habitual smoker. But it's not as well known that she was smoking an insane amount of weed as a teenager. She admitted to smoking up to 15 joints a day while in high school. Here's what she said in an interview, "I was smoking 15 joints a day. No tobacco. A day. It was a habit that eventually occurred when the pain got so bad with the hip. I was just numbing, numbing, numbing myself and then sleeping it off and then getting on stage, killing it in pain, then getting off and smoking, smoking, smoking, not knowing what the pain was." Lady Gaga didn't start smoking cigarettes until later on.