To answer to actual question, yes I do think it will disappear, though not in any of our lifetimes I suspect.
The cost/tax will be little do do with it, more a social thing I reckon. This will come about by more bans until smokers have virtually no where to go.
Although I hate smoking I also am not keen on a Government telling me what to do. On balance I think I would opt for a free society above one that bans and controls my life. Dont suppose I'll get my wish now we are in a Police state though.