far public environment harmful smoke healthCigarette PollutionCigarette smoking is one kind of pollution. It is the most (1)pollution in our lives and dangerous to our (2).Smoking pollutes both the outdoor and the indoor (3). Outdoors, besides fouling the air, it makes the streets dirty, for some smokers throw cigarette butts everywhere. However, the indoor environment is (4)more polluted. When you enter a meeting-room, you'll get a cough, because it is full of smoke and smells terrible. In a train, you'll find yourself covered with (5)if some smokers sit nearby. And you'll be unlucky if you share a room in a dormitory with a roommate who is a heavy smoker.So, let us work together to make more (6)places non-smoking areas.