We become an average of the five people we spend the most time with. Our friends and social circles determine who we become. Therefore we should be very careful with who we decide to spend our time with.
If most of our friends practice unhealthy habits, we are likely the same. Smokers gravitate towards other smokers. Drinkers like drinkers. The same goes for emotional eaters. People who eat to deal with their emotions will gravitate towards others who do the same. People like people who are just like them.
As much as I hate to say it, when pursuing your health goals, it is possible that you may have to change your friends. If they don’t support your goals, they are in the way. Get rid of them. Your health is more important than your current social circle. Don’t let your friends' bad habits get in the way of you building good ones.