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.