Smoking is highly addictive and causes many serious health risks and diseases. Nicotine is the addictive substance in cigarettes that is as addictive as heroin or cocaine. Teenagers often start smoking due to peer pressure or mistaken beliefs that it makes them look cool or slim. However, smoking can cause cancer, heart disease, COPD and many other illnesses. It is the largest cause of preventable death worldwide. There are many resources available to help people quit smoking such as nicotine replacement therapies and lifestyle changes. Quitting smoking has significant health benefits and is important for both individual and public health.