One study has examined the impact of minors' participation in to bacco purchase attempts (TPA' s) on the minors' likelihood that he or she will engage in smoking or illegal tobacco purchase attempts . Alcaraz et al . ( 1 997) surveyed forty-eight minors who attended tobacco education workshops. Afterwards, thirty-six of these minors were ran domly assigned to a TPA group. The remaining eleven minors were as signed to a control group that did not engage in TP A' s attempt to purchase cigarettes. After surveying the minors two years later, the au thors found that none of the minors initiated smoking habits. Further more, some of the minors in the TPA group were influential in helping their parents quit smoking or asking friends not to smoke. Thus, the mi nors ' participation in the TPA' s did not increase the likelihood of com mencing smoking habits. In fact, the authors felt that having minors involved in TPA' s would actually be an effective prevention effort to help keep minors and their peers from using tobacco.