RT Article T1 Perceived ease of access and age attenuate the association between marijuana ad exposure and marijuana use in adolescents JF Health education & behavior VO 47 IS 2 SP 311 OP 320 A1 Turel, Ofir LA English YR 2020 UL https://krimdok.uni-tuebingen.de/Record/1912648830 DO 10.1177/1090198119894707