I think I am on the way to eradicating it. I made up a 25% solution of ammonia, one of the few things that dissolves nicotine and using a trigger spray, lightly wetted the front carpet, letting it soak for a few minutes before dabbing it off with a moistened cloth. It seems to be working so next week, I shall take out the seats and give the whole carpet a good going over. I shall do the headlining as well. It will be a much nicer car if it doesn't stink!