Veronicah Kibe2025-12-162025-12-162025-12-16https://repo.pacuniversity.ac.ke/handle/123456789/5548There is concern on the steady increase of poor mental health among adolescents in Kenya. The majority of young people are introduced to pornography during their adolescence, and for many people it becomes a habit and for others it almost becomes an addiction. This study’s objectives were to establish the causes of pornography addiction among adolescents in selected secondary schools in Kajiado North Sub-County, Kenya, assess the effects of pornography addiction on adolescents' mental health in selected secondary schools in Kajiado North Sub-County, and evaluate measures to curb pornography addiction among adolescents in these schools. The study was guided by the social cognitive theory and the ecological systems theory. The research design for the study was descriptive. The target population for the study comprised secondary school adolescents in selected secondary schools in Kajiado North Sub-County. The population included boys-only, girls-only, and mixed day and boarding public and private schools in the sub-county. The study employed the Yamane (1973) formula to determine a sample size of 366 adolescents. The researcher purposively sampled six secondary schools in Kajiado North Sub-County. The target population consisted of 4,337 guidance and counselling teachers and students, from which a sample of 382 respondents was selected through stratified sampling to determine the number of respondents in each school. In each of the six schools, respondents were randomly selected from each class. The study employed a census for the guidance and counselling teachers. Data was collected through a semi-structured questionnaire and an interview guide. A pilot study was conducted at Ole Kasasi Secondary School. Data was recorded in Microsoft Excel before being coded and entered into the Statistical Package for Social Sciences (SPSS) version 29 for analysis. Descriptive statistics were used to describe the characteristics of the sample, while thematic analysis was employed to examine qualitative data. Findings were presented in tables, pie charts, and graphs. The study established that easy access to the internet, lack of parental control, peer influence and emotional distress were significant causes of pornography addiction among adolescents. Addiction had significant negative effects on adolescents’ mental health. Schools implemented measures against adolescent pornography addiction, including internet restrictions, digital literacy, counseling, parent workshops and engaging extracurricular activities. This study recommends that schools should implement advanced digital monitoring systems that prevent students from accessing explicit content. Parents and guardians should educate adolescents about sexuality and responsible internet use. Schools should introduce peer-led intervention programs and community-based mentorship initiatives should be established.enThesis