Alcohol
According to extensive research, alcohol is a risk factor for 7 different varieties of cancer. Even small amounts can lead to an increased risk of cancer, especially when it is consumed every day. Liver cancer is one of the most important, especially related to alcoholism, but drinking too much may increase your risk of esophageal cancer, mouth cancer, pharyngeal cancer, breast cancer, and colon cancer. It is even worse when patients drink and smoke at the same time because smoking is an additional source of free radicals and carcinogens.