Table 1.
Recruitment results from 6 cannabis use Web surveys disseminated using Facebook advertisements (ads).
| Surveya | Ad delivery time frame | Total ad cost ($ USD) | No. of people who saw ads | No. of ad clicks | Sample sizeb | Ad images | Demographics and cannabis use patterns of recruited sample | |||
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Age, mean (SD) | Male, n (%) |
White, n (%) |
Current usec, n (%) |
| Survey 1d | 43 days | 800 | 168,894 | 3708 | 2838 | Cannabis leaf; College logo | 32 (16) | 2391 (84.24) | 2048 (72.16) | 2333 (82.20) |
| Survey 2 | 28 days | 809 | 231,400 | 3932 | 933 | Multiplee | 44 (18) | 758 (81.2) | 794 (85.1) | 724 (77.6) |
| Survey 3 | 20 days | 350 | 126,945 | 5480 | 2630 | Cannabis leaf | 16 (1) | 1201 (45.67) | 2067 (78.60) | 2185 (83.08) |
| Survey 4 | 6 days | 293 | 78,974 | 3135 | 1813 | Cannabis leaf | 48 (13) | 1386 (76.48) | 1608 (88.70) | 1540 (85.94) |
| Survey 5d | 9 days | 402 | 68,525 | 2599 | 1212 | Cannabis leaf | 28 (11) | 784 (64.69) | 1029 (84.90) | 1132 (93.40) |
| Survey 6d | 7 days | 377 | 96,096 | 5612 | 2972 | Cannabis leaf; Cannabis plant | 35 (10) | 1815 (61.07) | 2653 (89.27) | 2549 (85.77) |
aEligibility criteria for all surveys: (1) lifetime cannabis user, (2) age 18 years or older, (3) provided consent/assent, and (4) currently living in the United States. Exception for survey 3 in which the age eligibility criteria was 14 to 18 years.
bRespondents who (1) met eligibility criteria, (2) passed data-quality checks, and (3) completed the survey.
c“Current use” indicates individuals who used cannabis at least once in the past 30 days.
dParticipants permitted to skip questions. Reported sample sizes may vary depending on the variable analyzed.
eAdvertisement images included cannabis leaf, cannabis plant material, Dartmouth College logo, methods of use (eg, joints), depictions of smoking behavior, and smoke clouds.