I am a smoker! I know it is not nice for me and it is going to most likely be the death of me, but it’s just something that is what it is. I have been smoking for about 30 years. But there is one thing I do that a lot of other smokers do not! That is I never smoke in my home or let anyone else smoke in my house. The reason for this is not only because of the air quality, because cigarette smoke can certainly damage your central heating and a/c. The smoke can get all up in the air vents and then travel to the ductwork which in turn could clog it. This would make the central heating and a/c plan work overtime just to pump air flow through your home. Then before you know it, it would break down and either need to be replaced completely or have a new motor put in. Both of these things would cost a lot of money! So the best course of action to prevent this is to never smoke in the house. Sure, I have smoked a few times here and there, right by the window with it open. This was only when there was bad weather outside! Other than that, I always make it a point to smoke outside my home to not mess up or even risk messing up my central heating and a/c plan unit! I paid a lot for this heating and air conditioning plan and I would never want to damage it by our own doing.