“…4,5 Still others have shown correlations between the intensity of brand-specific cigarette advertising and brand awareness, preference, [6][7][8][9][10][11][12][13][14] or brand market shares 12,15,16 among youths. Many cross-sectional studies have reported associations between exposure to cigarette advertising or participation in promotional activities and attitudes toward smoking, 17 susceptibility to smoking, [18][19][20][21][22][23] and smoking behavior 6,9,11,17,19,21,22,[24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] among youths. Because of the cross-sectional nature of these studies, it is not possible to determine whether the exposure to tobacco marketing preceded and contributed to smoking initiation or whether smoking initiation preceded increasing receptivity to tobacco advertising and promotions.…”