Things change around us every day. We have to work to keep up with it.
Hoggie uses cardboard scratchers and makes a huge mess. I'm thankful that he's never clawed other things but it builds up fairly fast on the blanket I put his scratcher on then he tracks it everywhere even though I ask him to pick up his feet. Most of us have learned not to run the vacuum over our foot because we are aware.
Quitting smoking is not any different. We just have to be aware until we fuhgetaboutit.