Peer pressure can be a very powerful tool against teens. It can be used to convince peers to drink, smoke, steal and many other things. Too many times teenagers end up in jail, pregnant, or in some other kind of trouble because of something they were pressured into doing. They do things they have never done before like; lying to their parents, drinking alcohol, smoking, and sometimes illegal things. They do all these risky things because they have been pressured into doing what is "cool". It can be very hard to stand up for yourself, as a teen trying to fit in, especially when your being ganged up on by your peers to do something you wouldn't normally do.
Peer pressure can also be used by teens to convince other teens to go to church, not party, or hang with the wrong crowd. Although this kinda of peer pressure is rarely used, it's very beneficial. Sometimes when one teen see's another going down the wrong path and making bad decisions, they try to pressure them into doing the right thing. Teens often tell each other to "be safe" when their; having parties, drinking, or putting themselves into any situation that they could get into trouble. Although this is positive peer pressure, it's normally not as powerful or convincing as negative peer pressure because it implies that what that teen is doing, is okay or safe.
Peer pressure is a very diverse tool, that can be used for good and bad, but overall it's a more powerful tool when used in a negative way. Because of this and the fact that negative peer pressure is used more often, I believe that peer pressure can be, but is not, more beneficial than harmful.