4. Discussion
Hookah and ENDS users actively use the Internet and social media to obtain and share information about hookah and ENDS. Based on the social media analysis and the interviews, the study participants who use hookah were more likely to share photos and discuss hookah related activities via social media than those who use ENDS. Hookah-related social media behavior was associated with low perceived vulnerability to tobacco related diseases, as well as high influence of social pressures. ENDS users strongly believed themselves to be at low risk for tobacco related diseases, a belief even stronger among those who tried an ENDS-product because of something that they had read on the Internet. Since those who posted hookah photos on social media believed themselves to have significantly lower vulnerability to disease than those who didn't, this suggests that hookah users may be influenced by the social norms enforced by photos on social media. Our data support the assertion that both hookah and ENDS users may be easily persuaded by information found on the Internet