Dan Aykroyd smokes like a chimney in that movie. The only Ghostbuster who didn't smoke at all was Harold Ramis. Even by the time of Ghostbusters 2 the smoking was toned down and I'd bet good money we don't see any smoking in the 'ghostbusters 3' video game.
Ramis actually talks about this on the DVD commentary - the second biggest change between the first and second movies was the overnight shift to CGI, which they figured would be more gradual. The first biggest change was the smoking thing.
I also love that Winston is TRYING to make a point and Ray is off on this esoteric tangent about architecture and Winston is all DUDE RAY SERIOUSLY HOLD UP MAN I JUST THOUGHT OF SOMETHING FUCKING HEAVY SHUT UP ABOUT THE ALLOYS.