Components of the intervention included @ ) the out-of-school `` Smoking Prevention Tour '' ( SPT ) at the `` Luoghi di Prevenzione '' Center , a @-hour ( @ sessions ) extracurricular activity ; @ ) the `` Smoke-free Schools '' intervention , combining a life-skills-based peer-led intervention at school , an in-depth lesson on one of the SPT sessions , and enforcement surveillance of the school antismoking policy .