You can't make someone change, but you can be honest. Maybe your friend will listen. You might even talk a person into getting help. The worst thing that can happen when you drink is to end up with a raging hangover. If you drink enough alcohol, fast enough, you can get an amount in your body that can kill you in only a few hours.
Drugs are a bigger problem than alcohol.
Ten million Americans are addicted to alcohol. It is a drug. Alcohol makes you more sexy. The more you drink, the less you think. Alcohol may loosen you up and make someone more interested in sex, but it interferes with the body's ability to perform.