Tricky.
These will NOT eliminate the odor of cigarette smoking entirely.  You've got the cigarette itself and a tiny cloud does exit the other end.  To give credit where credit is due, it is a pretty inconsequential cloud.  The main drawback is that you have to blow into them in a very specific way or else the smoke, seeking the path of least resistance, will come out of your nose!  Practice, though, and you'll get the hang of it.<br /><br />In all, I'd say it deals with about 75% of the odor, when used properly.
Rating: 4 stars