Dustin Diamond writes about his time starring on 'Saved by the Bell' as dork Screech in his new memoir 'Behind the Bell' -- and airs his co-stars' dirty secrets, Usmagazine.com reports.

Sex and drugs were par for the course during the filming of 'Bell,' Diamond says. He also claims that he "could smell a certain 'smoke,'" on set and adds that he believes Mark-Paul Gosselaar -- who played Zack Morris -- was on steroids.