The objective of this research is based on the case study of  a group of school  children who are  at risk  of consumption due to smoking and  the attitudes  shown  before  and  after a  pre-experiment,  through  weighted indices  for their  evaluation.  Different  methods and instruments  were  applied  at  the  empirical  level,  such  as  document  analysis,  observation,  and  analysis  of  the  products  of  the  activity,  descriptive statistics and Chernoff's faces, as a statistical tool to process in a human  face scheme the changes in the schoolchildren at risk. The analysis and discussion of the results in the  initial and  final stage  was expressed through  the control  and  evaluation of the variables in the quantitative and qualitative order with the purpose of guaranteeing the validity of the results on the risks of smoking.