This work was developed from the project approved in the Call for Proposals for Girls and Women in the Exact and Earth Sciences, Engineering and Computing,from the Carlos Chagas Foundation for Research Support in the State of Rio de Janeiro (FAPERJ), which aimed to promote young women s interest in scientific research with projects developed in public schools in the state of Rio de Janeiro.Cigarettes and contraceptives are common themes among young people, who oftenend up using them prematurely and were therefore chosen as the subject of this study. Cigarettes contain toxic substances that cause chronic degenerative diseases due to nicotine addiction. In turn, contraceptives act on hormones that can disruptthe cycles of essential elements in the body. The aim of this study was therefore to evaluate, using statistical tools, the elemental composition of the hair of smokers and women who take contraceptives, compared to that of people who do not use these substances. The hair samples were collected from volunteers from the schools participating in the project and analyzed following the methodology established at Labspectro, the Atomic Spectrometry Laboratory at PUC-Rio, for the capillary mineralogram, which consists of multi-elemental determination by inductively coupled plasma mass spectrometry (ICP-MS). Using the Kruskal Wallis test, significantly lower concentrations (p less than 0.05) of Na and Mg were identified in the group of smokers, and of Cu in the hair of women taking contraceptives. In Spearman s correlation analysis, higher correlations were identified for some toxic elements, such as Cu/Pb and Cr/As, for the group of smokers, while correlations involving Co, Se and I were obtained for women taking contraceptives. Principal component analysis confirmed the results of Spearman s analysis, but it was not possible to establish a clear and distinct separation of the groups studied. Thus, it can be concluded that smoking and the use of contraceptives interfere with the results of the hair mineralogram, and further studies are needed to assess the health implications of these differences.