If your friend is smoking two packs a day, drinking a 12 pack of beer, and knocking down 3 big macs a day........

What is the root cause of all of this? I noticed that people who drink too much are often "self medicated" and mainy people who smoke, which is an addiction, no different than any other drug, also often have mental health issues sometimes caused by the addiction itself.

You are going to tell him anything they don't already know by the "not healthy speech" but i you want to take the larger step of figuring out how to find them resources and help for whatever life conditions are causing the behavior described you are doing something to address the issues and not just the symptoms.