Having a gambling friends or mate will make you to be addicted in gambling, so I believe that as a gambler, you need to follow your own ways of gambling method, do not have a group kind of gambling mates that might lead you to be addicted in gambling, in other way round once someone is addicted in the group other's may be indirectly be affected
In other way round, if you wants to make it in gambling you have to follow your own direction in gambling, and not basically depends on other people kinds of gambling.
Having friends who gamble doesn't mean you'll end up addicted. The most important thing is to have self-control and know your limits, especially when gambling involves gambling. Enjoy having fun with friends, but know when to stop. At the end of the day, it's just a game, and it should remain just fun.