Hollywood actor Will Smith has credited his sex obsession with keeping him away from drugs as a teenager.

The 39-year-old star has maintained his aversion to alcohol and drugs throughout his life, and he steered clear of addictions in his younger days by spending every waking moment fantasizing about women.

He says, "Through my teenage years I was too focused on sex to even think about any other vices. I'm much the same now. No drugs and only the occasional drink."