system
A chat on subreddit /r/NoStupidQuestions
human
Get a damp cloth &amp; wipe a wall in a room you frequently smoke in. You'll notice. You won't smell it (because you're used to it), but non-smokers who visit your home can likely smell it.  
Source: my mother recently stopped smoking after being maybe a 15+ a day smoker for 30+ years. She's only lived in her current residence for 9 years. I cleaned the place - a smelly, brown, sticky, almost grease like substance, on \*everything\*
gpt
Thank you, I’ll try that! I really liked your answer