The stench of cigarette smoke goes on and on because it sticks to everything. It gets in your hair, all over your clothes, all over your bed, curtains, carpet, furniture, ceiling, adds a yellow film to your windows, walls and mirrors, makes your breath disgusting, etc. If you smoke at all, EVERYONE KNOWS. I used to smell my neighbor's cigarettes from across the street until she died of cancer 2 years ago. Now I don't have to smell it anymore. Understand?