Smoking, such a habit, despite knowing the consequence, there are people who never quits. Smoking, which is also known as the "cancer stick", not only harms the smokers, but also the surrounding people and the environment. Especially, smoking inside a room can be hazardous. However, in many countries it is still allowed to smoke inside establishments, hence, increasing passive smokers. I strongly believe, smoking inside a building should be prohibited and in this essay I will try to elucidate the reasons behind my belief.