RT Article T1 Reassessing the marijuana gateway effect JF Addiction VO 97 IS 12 SP 1493 OP 1504 A1 Morral, Andrew R. A2 Paddock, Susan M. A2 McCaffrey, Daniel F. 1963- LA English YR 2002 UL https://krimdok.uni-tuebingen.de/Record/1912678152 DO 10.1046/j.1360-0443.2002.00280.x