Folks: Where did this thread start? I remember making a JOKE that maybe smoking doesn't prevent PD but stopping causes it. That's the last thing I remember seeing on the topic. And now a survey. Have I missed something or are we beginning to "amplify the noise?" BTW: I quit around 1988 and was diagnosed in 1995. I quit during a third stage smog alert in LA. I decided cigarettes were redundant under such circumstances and I could save money simply by inhaling outside air from my balcony. I don't dare make a joke about PD and third stage smog alerts! Ron Reiner (49/2)