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Over the period of one year, 4.2% and 6.1% of risk-free students became tobacco user and sexual risk-takers, respectively, and 22.4% of tobacco user students, transfer to the multiple risk-taker group. CONCLUSION The prevalence of risk-taking behaviors increased during the freshman year. Tobacco smoking was predispose acquiring more risky behaviors. Probability of transition to the multiple risk-taker group was higher among tobacco users.BACKGROUND Pediculosis capitis is one of the most common contagious diseases in overcrowded places,