The researchers analyzed the contribution of parental and peer norms to adolescents' gambling initiation. Adolescents aged 12–17 years filled out a baseline survey and a follow-up survey one year later. Only adolescents who reported not gambling at baseline were included. Of the 440 participants, 36.4% reported starting to gamble at follow-up. Peer factors were positively associated with gambling initiation. Higher susceptibility to peer pressure and perceived gambling among peers were associated with higher chances of gambling initiation. Peer and parental approval of gambling was also associated with higher chances of gambling initiation. But perceiving one’s peers gambled too much decreased the likelihood.