Many smokers know that the harmful effects are not only affecting to themselves, but also harming the others in the vicinity. However, most smokers do not know that if one person smokes, the whole family get exposed. Besides, they do not know that the child exposed by tobacco smoke will get disease or even be death. There are 24,000 deaths from tobacco use and 3,000 deaths from second-hand smoke every year in Taiwan. In addition, there is about 150,000 to 230,000 people getting disease caused by second-hand smoke every year, which is equivalent to one death of non-smoker getting disease caused by other smokers every 2 minutes.

According to Global Youth Tobacco Survey from Health Promotion Administration in 2016, 90% of the youth know that the harmful effects of second-hand smoke (95.2% in junior high school students and 93.8% in senior high and vocational high school students). However, more than 30% of the youth get exposed to second-hand smoke due to the elder member of family smoking at home (32.6% in junior high school students and 32.4% in senior high and vocational high school students).

Most of the heavy smokers think that the harm of tobacco only happens during smoking and think that it will be safe merely by changing places or opening windows. In fact, second-hand smoke and third-hand smoke are carcinogens. They can still harm the others at any concentration even you smoke at indoor well-ventilated places.