You are concerned about a classmate who is binge drinking on a regular basis and want to let him know about long-term complications that may result from that practice. what would you tell him to try to convince him to cut back on drinking?

I would ask him what his aspirations in life are, then explain how he wouldn't be able to meet those goals if he keeps drinking like that. Don't emphasize the illegality just because, use the illegal underage drinking part to further demonstrate the consequences that could potentially last for his entire life.