Drinking alcohol is another huge problem and addiction. The surprising thing is that you do not have to be an alcoholic to suffer from health issues related to alcohol. Researchers conducted a study in which 200,000 women took part. The study lasted for 14 years. Experts found out that the participants who drank one serving of alcohol a day increased the risk of breast cancer by 30%. The first leading cause of cancer is, no doubt, tobacco. Alcohol is the second one. And we know how many people combine these two addictions making their life full of health problems. Alcohol causes a whole range of different types of cancer. The list includes rectum, mouth, colon, liver, esophagus, and female breast cancers.