Unless he is deaf and dumb, I am pretty sure everyone in society knows addiction causes serious health problems and/or death. In this day and age, you have to literally be unable to read, blind to see, and deaf to hearing anything to not know.
Read up on this site, you will hear time and time again how an addict fears for their life then will turn around and drink again. You don't hold the power of this in your hands at all.
The Three C's: You did not cause it, you cannot control it, you cannot cure it.
Step away and turn him over to God.