Second-hand Smoking In 2013, ministry of health stated that Indonesia is ranked third with the highest number of active smokers in the world [1] . Research proved that the amount of second-hand smoking (passive smokers) is around 40,5% of 250 million people [2] . Nowadays, a lot of people have not realized the dangerous effects of second-hand smoking to human, animals, and environment. The first thing that need to be known is that second-hand smoking could destroy human body and cause risky disease, such as cancer, coronary heart, and etc. Passive smokers has 24% chance of getting lung cancer and 25% coronary heart [3] . Another research proves that 37,786 people in Indonesia die due to lung cancer. The second thing is that second-hand smoking danger the health of animals. A lo...