Former Happy Days star Scott Baio can't understand why young stars dabble with drugs because he was too obsessed with staying fit to pump his body full of pills and powder.

The former child star admits he was a handful at times, but he was never interested in drugs and alcohol.

He tells America's Closer magazine, "I was never intrigued by drugs or alcohol. It seemed silly to me; if you were lucky enough to be blessed with a healthy body, why would you do anything to mess with that?"

Though he can't understand stars like Justin Bieber and Lindsay Lohan, who risk it all by dabbling with drugs, he does have some advice for the next generation of pop and Hollywood heroes and heroines, adding, "If you keep your head screwed on, it is an amazing life. That’s my credo."