Why humans are so bored that they must smoke to pass the time and relieve stress may be a mystery, but it also reflects the fragile side of the human heart. Dr. Graham, the famous American thoracic surgeon who first studied the harmful effects of smoking, was also a smoker and eventually died of lung cancer. We don’t blame a few decades ago when medical science was not well understood, but why are there still so many smokers today – an era when a direct link between smoking and disease has been established beyond doubt. Twenty-five percent of men and 20 percent of women in the United States still smoke, a figure that is not available in China, but the annual tobacco sales are enough to suggest that the problem may be even worse than in the United States. Lung cancer is 8-20 times more likely in smokers than in non-smokers. There are at least 40 substances in tobacco that are carcinogenic, but interestingly nicotine is not carcinogenic, just addictive. The harmful effects of tobacco on the human body are directly proportional to the length and amount of time smoked. The younger you start smoking, the higher your chances of developing the disease, and the earlier you quit, the lower your chances of developing lung cancer, according to the WHO slogan: “Never late for quitting smoking”. WHO has proposed six measures for global tobacco control: 1. monitoring tobacco use and prevention policies. 2. 2, to protect people from the hazards of tobacco smoke. 3, to provide help to quit smoking. 4.Warning about the dangers of tobacco. 5, ban tobacco advertising, promotion and sponsorship. 6, and raise taxes on tobacco.