Knowing all the things you should and shouldn't do doesn't help much with the disappointment, does it ???
Support him - let him know that when he decides to quit, for good, you'll be there for him. cuz you REALLY ARE concerned for his health.
In the meantime, keep up your quit....you will be setting a good example for him. But do it for yourself !!!
Good luck, and please keep in touch, ok??
I'm on Day 11 and counting...Woo-Hoo !!!!!!!!!!!!!!!! .......We are winners !!!