Peer pressure is a term escribing the pressure exerted by a peer group in encouraging a person to change their attitude, behavior and/or morals, to conform to, for example, the group's actions, fashion sense, taste in music and television, or outlook on life. Social groups affected include membership groups, when the individual is "formally" a member (for example, a political party or trade union), and social cliques. A person affected by peer pressure may, or may not want to belong to these groups. They may also recognize dissociative groups with which they would not wish to associate, and thus they behave adversely concerning that group's behaviors. Most people who smoke say that they started or continued because of peer pressure.