e-cigs? Also, he does not understand preventive maintenance. He thinks that you turn to drs when you are on the verge of dying. In reality it might be too late by then. If he has a car, he knows the car needs to have oil changes. It needs maintenance. We fill it up with gas, wash it every now and then, etc. Maybe this analogy would work for him.

I think that the biggest issue is your father and not economics or health. In terms of the guy, he does very much seem like a good catch.