I did the five boro last sunday with my girlfriend. On several occasions, I broke out the cigarette while on my bike. You should have seen the reactions I got from people on this, I was very surprised.
One Marshall actually came over and asked me to butt out, giving me this incredulous look. Yeah right! Not even worth a reaction.
A few passed by - breathing heavily, asking me how I could bike and have a cigarette at the same time (destroying my peaceful bike and smoke moment).
While taking a "washroom" break through central park, some people asked my girlfriend why I smoke and bike at the same time.
These people thought this to be so incredible, and reacted like this was outrageous! What's up with that?
Seeing people on bikes with cigarettes and cell phones is common in Europe, South America and even some Caribbean countries. Once, while I was in Amsterdam, I witnessed this old man on a old singlespeed, smoking a cigarette, talking on the phone, and he had a cup holder attached to his bike with a beer in it, he was biking freehand (not entirely sure whether it was a cigarette in his hand either).
BTW, the downtube passed my test with flying colours. I was very impressed with the bike. I hope it works but here is a pic...