It's a common problem, there are a lot of people who just simply haven't had the kick up the arse they need yet, and you could do that ... or you could focus on your own life and your own journey they will deal with it in their own time. A lot of times, people react adversely to you trying to change their lifestyle and its often not worth your grief.

It's harsh to say or even try, but expand your social circles, make friends and surround yourself with interesting people who are actively trying to improve themselves, and you will find yourself much better for it. Tolle mentions it in 'The Power of Now' trying to force your partner or friend into bettering themselves is a fruitless ordeal, immerse yourself with people who can sympathise.

In short, make new friends.