We are always looking for ways to 'get through' to our friends and loved ones and using force is not a good method of doing it. Persuasion is. I say 'Go for the weak spot." (Vin Diesel - Riddick). Everyone has a weak spot. If you can find their weak spot then you've got ammunition to work with. If you think you've found the 'weak spot' introduce it ever so gently and see where it goes. When I say 'weak spot' it could be interpreted as guilt and that's not what I'm meaning. It's a dream that they may have shared with you - one that is still reachable, if they stop the nonsense. Example, if someone likes to draw and have a real talent for it, buy them a small gift like brushes and paint or even ask them to make a sketch of you. These are my thoughts/advise. What's worked for you?