Cigarette smoking can lead to discolored walls, desks, cabinet and even clothing, causing them to turn yellowish-brown (a similar color to the smoke itself). These stains come from the oily residue that a cigarette emits from the combination of tar and nicotine within it.
Smoke stains must be removed by scrubbing, either with hot water or a special cleaning solution and a scrub. Smoke stains should be scrubbed on a frequent basis because, if left unclean for too long, they may not become permanent.
Cigarette smoking can also cause an indoor space to smell like smoke. This is because, unlike outdoor areas, the smoke does not necessarily have an area in which to dissipate. A fan or open window may be necessary to properly ventilate an indoor space used for smoking.