Ew.

It would probably work to a certain extent depending on how long he holds in his hits, now if I had just gotten off of probation I would'nt worry myself with sucking back some dudes smoke that he just exhaled. I would blast a cone to myself. Personnally I think that's repulsive unless it's your own smoke.

Also, I'de use a plastic bag as you could get more air out of it to blow your smoke into, a bottle would not work to well.