I do know that some people have used candy, such as gummy candy and jawbreakers.  You could also use a balloon, since balloons can be stretched out a bit without making any noise.  You could also try using an ink-jet printer, by placing a cup underneath the cartridge and putting the cartridge upside down to prevent ink from being forced through it.
assistant
I'm not sure what's most effective or easiest for you.  If you want to do it completely under the radar, it would probably be best to avoid smoking altogether.  Otherwise, I'd say that using paper towels and a rubber band could work, but I'm not sure how well.
assistant
What's an easy way to sneak smoking cigarettes, without detection?
user
That's a little hard to say, since it depends on who's "detecting" and what technology is available to do that.
assistant
I've heard of people using paper towel rolls, air freshener towels, and a rubber band, and blowing the cigarette smoke through it, to cover the smell. I've also heard people can blow smoke into the toilet, if they flush it. Do you have any suggestions like these stealthy options?
user