The second effect of cigarette smoking is one that most people don’t even take into consideration. It stains the teeth yellow or sometimes even brown. Since this effect is long term, most people are not aware of it when they begin smoking. The truth is that a cigarette stain is very hard to eliminate from the teeth, and it will probably end up costing a considerable amount of money. Yellow teeth are disgusting because they give an unhygienic image and make people look older.