If you thought friends would help one quit smoking you're not wrong. However research has found that they actually encourage you to start smoking more than they influence you to quit. 'What we found is that social influence matters. It leads nonsmoking friends into smoking and nonsmoking friends can turn smoking friends into nonsmokers' said Steven Haas an associate professor of sociology and demography at Pennsylvania State University in the US. However the impact is asymmetrical - the tendency for adolescents to follow their friends into smoking is stronger Haas explained. There are a number of reasons why peer influence