“…Social factors that seem to be very strongly related to the use of ST include modeling and acceptance of use, e.g. peers or fi'iends that use ST or smoke cigarettes, parental use, and acceptance or perceived approval of use (Ary et al, 1989;Bonaguro, Pugh, & Bonagnro, 1986;Boyle, Claxton, & Forster, 1997;Chassin et al, 1985;Cohen, Sattler, Felix, & Brownell, 1987;deMoor et al, 1994;Dent et al, 1987;Gottlieb et aI., 1993;Gritz, Ksir, & McCarthy, 1985;Hill et al, 1992;Lisnerski et aI., 1991;Marty et al, 1986;Riley et al, 1990;Riley et at., 1991;Riley et at., 1989;Salehi & Elder, 1995;Williams, Guyton, Marry, McDermott, & Young, 1986). The extent of these influences may be a function of age.…”