Note: All paired t-test P values <0.05, except for (A) next-year intention to use HTPs vs. cigarettes among past-month e-cigarette only users (P = 0.927) and (B) perceived harm of cigarettes vs. e-cigarettes among past-month dual users (P = 0.772). In this sample (n = 2470), 67.0% (n = 1656) were past-month nonusers, 7.8% (n = 192) were past-month cigarette-only users, 13.5% (n = 333) e-cigarette-only users and 11.7% (n = 289) were past-month dual users of cigarettes and e-cigarettes.