It’s amazing how a person who have high tendency for substance abuse can morph from a normal decent person to a strange highly agitated narcissistic one.
I’ve done my share of this and that, but never did I go overboard, I never thought for a moment that more of this and that is more fun and elite, why? Am I more enlightened than him? No, we are from and we share the same environment. Worked in the same job when fresh out of school. Hung out with the same circle of friends. Maybe this and that just found a weak spot in him.
The total transformation is astonishing and scary. Would it lead to the point of no return? Yes! would he listen to advice? No, narcissism does not entertain advice. Do you see in him the friend you knew before? No, not really.
What to do?
Wish him well.