Alcohol is always a tough one to give up. It's interwoven into society in such a way that you're almost excluded if you don't drink it. Don't drink at college? You'll be branded as no fun. Don't attend after work drinks? You might miss out on some important conversations. Being the only one without a drink in your hand can make you feel alienated from the rest of the group, so it's understandable why it's so hard to stop.
Maybe if people knew that alcohol was the second leading cause of cancer behind tobacco, they'd be more inclined to give it up. Anyone with breasts should be extra careful, as it's the leading cause of breast cancer. But alcohol also causes mouth, esophageal, liver, colon, mouth, and rectal cancer, so we all have to watch out.