Sorry to hear this. All you can do is lead by example, become the Omega point for health, and be available to help them make incremental changes. Eventually the PoW on your health will become too loud to ignore.
Discussion
I will definitely continue leading by example and hopefully I’ll reach one of them event. In the end you’re right but it’s tough to watch them all struggle with something so obvious (and fixable) and them be so delusional about their addictions and the effects.