Everyone has been sucked into peer pressure at one time or another. peer pressure is hard to escape. somethings people get peer pressured into doing life changing things, for example smoking, drinking, having sex, etc. they are all stuff people can be pressured into doing.
Those can bring new "habits" that are hard to get rid of. teens especially are most likely to be sucked into peer pressure. teens are less confident, and most are only trying to be in the "cool crowd". you know the kids who think their better and most of the time richer than everybody else. well everybody has faced those types of kids. but most the time the kids in the "cool crowd" just act like there your friends and act like they like you because they want to get you to do things.