Credit: Kevin Mazur/WireImage for MAC Cosmetics

Lady Gaga admits she dabbles in drugs.

"My schedule is such that I don't get very much time to eat. But I certainly don't have an eating problem. A little MDMA [Ecstasy] once in a while never killed anybody, but I really don't do drugs," the singer, 24 -- who has been rumored to be on a baby food diet -- tells the UK Times Online. "I don't touch cocaine any more."

Continues Gaga, "I don't smoke. Well, maybe a single cigarette - with whisky - while I'm working, because it just frees my mind a little bit. But I care about my voice. The thrill of my voice being healthy on stage is really special. I take care of myself."

The "Telephone" singer says she stays sane by taking "prescription medicine."

"I can't control my thoughts at all. I'm tortured," she says. "But I like that. [Spanish poet] Lorca says it's good to be tortured. The thoughts are unstoppable -- but so is the music. It comes to me constantly."

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Gaga says she has heart palpitations. "It's just from fatigue and other things. I'm very connected to my aunt, Joanne, who died of lupus. It's a very personal thing. I don't want my fans to be worried about me."