I'm a reformed heavy pipe smokers of some 40 years practice, kicked the habiit about ten years back, went cold turkey while on a trip to South Africa and havn't touch anything since, still get a little urg if someone walks by smoking a good quality Havana.
Once purchased a run down house with a brownish hase on the inside of the glass windows, realised what had caused it when I found the Mary J growing in the back garden and a packet of seeds under one of the carpets.