Tell him, he will lose his hair, his teeth, and probably have high blood pressure which gives you strokes, some small some huge,enough to whack you off your feet anytime, anyplace and not know what happens to you. You become weak and not stable on your feet, because the nerves in your body are intensifying. You will need foot massages, because you won't feel your feet after awhile. The blood flow from your feet to your head becomes thicker and thicker, might need stents. The heart has to work harder because the look is too thick.
Read this to him and if he still laughs, and says that it won't happen to me, get yourself prepared financially, and mentally. It's a long hard road downhill, sometimes, it's slow and some times it's fast.
If you have kids, talk with them about it and remember your the caretaker and You must Take Care of Yourself First, otherwise you might go first.
