00726nam a22002417i 450000500170000000800410001702200220005802200230008004100080010310000170011124501070012865000130023565000140024865000120026265000220027465000210029665000270031765100110034465300150035565500150037070000150038577300840040020141212093842.0970527s1997    sp     gr     000 0 spa c  a1067-828X (papel)  a1547-0652 (online)  aeng1 aMILLER, T.Q.10aWEEKLY MARIJUANA USE AS A RISK FACTOR FOR INITIAL COCAINE USE: RESULTS FORM A SIX-WAVE NATIONAL SURVEY14aCannabis14aCocaína14aConsumo14aDrogodependencias14aEstudio nacional14aFactor de protección14aEE.UU.10aAdicciones 4aDocumental1 aVOLK, R.J.0 tJOURNAL OF CHILD AND ADOLESCENT SUBSTANCE ABUSEgVol. 5, no. 4 (1996), p. 55-78