Study says you will be influenced more by new teen 's friends ' behavior . Family and friends will ` ` spread '' obesity , drinking , smoking , and even happiness . Results emphasize how to learn more about who your child hangs out with .
Study says teens will be influenced more by new partner 's friends ' habits . Family and friends can `` spread '' obesity , drinking , smoking , and even happiness . Results emphasize need to learn more about people your teen hangs out with .