This training provides an introduction to integrating the concepts/theories of social identities and peer-crowds into effective health promotion programming in tobacco control for a youth target audience. This module explores the concepts of social identities, peer-crowds, target marketing, social branding and the social identities approach. This module also examines various campaigns that currently use the SI approach, and it reviews different strategies and tactics utilized in tobacco control campaigns to be effective in changing attitudes and behaviours towards health norms in tobacco use.