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[pt] O uso de cannabis é um problema de saúde pública crescente, associado a diversos desfechos negativos. A identificação de fatores de risco é relevante para a prevenção, pois nem sempre tratamentos são eficazes. O abuso sexual infantil é considerado um forte preditor de uso e transtorno por uso de cannabis (TUC). Com a expansão da internet a violência sexual assumiu novos formatos, fazendo surgir um fenômeno contemporâneo denominado vitimização sexual on-line (VSO). Esta dissertação se dedicou ao aprofundamento do tema e realizou uma revisão narrativa com o objetivo de sintetizar o conceito de VSO e seus paralelos com abuso sexual off-line. Além disso, foi investigado exploratoriamentea VSO na infância e adolescência e suas associações com o uso de cannabis e TUC. Análises de regressão investigaram o efeito preditivo de VSO no uso de cannabis ao menos uma vez na vida e na idade do primeiro uso de cannabis. Mais de 70 por cento da amostra relatou ter sofrido VSO na infância e adolescência. Mulheres apresentaram quase o dobro de prevalência que os homens, com médias mais elevadas nas subescalas de insistência e ameaça. Minorias sexuais foram mais prevalentes que heterossexuais em todas as subescalas. A VSO foi capaz de prever significativamente o uso de cannabis pelo menos uma vez na vida e a idade do primeiro uso, mas somente a subescala de disseminação. Os resultados sugerem que VSO na infância e na adolescência é um fenômeno com alta prevalência, que pode estar associada ao uso de cannabis. Crianças e adolescentes merecem atenção especial porque utilizam a internet com maior freqüência, ficando expostos a riscos. Dessa maneira, é necessário pensar estratégias para prevenção de ocorrência de VSO e seusefeitos adversos. / [en] Cannabis use is a growing public health problem, associated with a variety of negative outcomes. The identification of risk factors is relevant for prevention, as treatments are not always effective. Child sexual abuse is considered a strong predictor of cannabis use and cannabis use disorder (CUD). With the expansion of the internet, sexual violence took on new formats, giving rise to a contemporary phenomenon called online sexual victimization (OSV). This dissertation was dedicated to deepening the theme and carried out a narrative review with the objective of synthesizing the concept of OSV and its parallels with offline sexual abuse. In addition, we exploratory investigated OSV in childhood and adolescence and its associations with cannabis use and CUD. Regression analyzes investigated the predictive effect of OSV on lifetime cannabis use and age of first cannabis use. More than 70 percent ofthe sample reported having suffered OSV in childhood and adolescence. Women had almost twice the prevalence of men, with higher means in the insistence and threat subescales. Sexual minorities were more prevalent than heterosexualin allsubscales. The OSV was able to significantly predict lifetime cannabis use and age atfirst use, but only the spread subscale. The results suggest that OSV in childhood and adolescence is a highly prevalent phenomenon that maybe associated with cannabis use. Children and teenagers deserv especial attention because they use the internet more frequently and are exposed to risks. Thus, it is necessary to think about strategies to prevent the occurence of OSV and its adverse effects.

Polyvictimization across contexts has been found to be associated with negativepsychological adjustment among adolescents. This study aimed to explore the differences inpsychological adjustment outcomes amongst adolescents who experience victimization andpolyvictimization in a single context. Another aim was to investigate the possible moderatingeffect of peer support on psychological adjustment outcomes. Cross-sectional data from theYouth and Sports Project was used, with a sample of 675 Swedish adolescents in 7th grade(Mage= 13.1). Through cluster analysis, separate groups of adolescents were identified basedon their victimization experiences. Two of these groups were classified as experiencingpolyvictimization. The main findings showed that polyvictimized youth reported higherlevels of depressive symptoms and school stress, as well as lower levels of self-esteem andpsychological well-being, compared to non-victimized youth and those experiencing oneform of victimization. The results also showed that polyvictimized youth did not benefit frompeer support in relation to the psychological adjustment variables, compared to nonvictimizedyouth and those experiencing one form of victimization. This suggests thatpolyvictimization in a single context is associated with negative psychological adjustmentwhich is not buffered by peer support.