I thought of 'tankypli' (tobacco-use) but I discarded it. pilno is currently defined " x1 uses/employs x2 (tool, apparatus, machine, agent , acting entity) for purpose x3" which doesn't seem to me to have much to do with what you do to a smoke. 'xaksu' would be better as a general term, now I think of it, or 'se zdile'. Colin