Even after accounting for a wide range of well-studied social, political and demographic factors that influence intentions to vaccinate against the coronavirus, regular Rogan listeners — who made up 22 percent of our sample — were significantly less likely to intend to vaccinate than those who do not regularly listen. However, we only found this pattern after the first round of federal government emergency-use approval for the Pfizer-BioNTech and Moderna vaccines in the study’s December and February waves. This coincides with when Rogan began to talk more — and skeptically — about the vaccines. For example, in January 2021, he said he may not receive a shot. That came after he moved from California to Texas to get “more freedom,” while disparaging people who wear masks. Shortly afterward, he posed maskless while meeting the Texas governor. In short, Rogan repeatedly spread dubious coronavirus-related information. In December 2020, regular Rogan listeners’ intentions to vaccinate were 15 percentage points lower than those of non-listeners. By February 2021, they were 18 percentage points lower, both statistically significant effects. That’s also noticeably different than for listeners of comparable radio programs and podcasts.