Tobacco and alcohol can cause damage to many organs of the body, and frequent smoking and drinking can also greatly increase the risk of cancer. Cigarettes contain a lot of nicotine and tar, and frequent smoking will cause a certain degree of damage to the respiratory system, such as causing bronchitis, inducing pneumonia, etc. In addition, smoking will also inhale carbon monoxide, which will increase the formation of atherosclerosis. In addition, smoking also inhales carbon monoxide, which increases the formation of atherosclerosis, which is closely related to heart disease. Drinking alcohol will bring burden to the liver, when alcohol enters the body, it needs to be metabolized and detoxified through the liver. Drinking large amounts of alcohol on a regular basis will increase the metabolic burden on the liver, which will easily affect the normal function of the liver and slowly develop into hepatitis, fatty liver, cirrhosis, and even eventually liver cancer. Frequent drinking also causes damage to the nervous system, such as memory loss and forgetfulness. In addition, nicotine and alcohol in tobacco have been classified as class 1 carcinogens with clear carcinogenic effects, and are associated with a variety of cancers. So for the sake of health considerations, usually try not to actively smoke and drink, but also try to stay away from second-hand smoke.