I rarely ever used my smoke units on my diesels and on my postwar steam engines only occasionally added a post war smoke pill. When I did use the smoke I opened the large sliding door to the train room and also opened a rear door to get cross flow ventilation. Even then I ran the engines with smoke for a short period of time. I have always felt that anything you inhale could be harmful in excess or over time, so I try to limit exposure to things like that. However if anything or anyone smokes in my train room it better be a steam engine as the sign on my train room states!
