The World Health Organization estimates that nearly 700 million people, nearly half of the world's children, are living in an atmosphere polluted by cigarette smoke. Cigarette smoke contains more than 4,000 chemicals. Of these, more than 200 are harmful to health, including addictive substances and toxic substances. Every year, cigarettes and tobacco kill millions of people worldwide. Smoking is a cause of preventable illness and death. With the above effects, quitting smoking is extremely necessary.