People who smoke don't think their stuff smells. I lived with a smoker for 25 years and never thought my house smelled like smoke until I asked him not to smoke in the house anymore because of sinus infections I was getting. Guess what, my house smells of cigarettes and I couldn't smell it while it was going on. I had to paint the walls and ceilings and even now a few years later I still come across something that is sticky with nicotine residue.
When he comes home from work and walks in the door, it's like OMG drop your clothes at the door please.