The study investigated the effect of miraa (Khat) on secondary schools e.g. mixed secondary school, boys’ secondary school and girls’ secondary school, in Gachoka constituency in Embu County. Miraa farming and chewing is one cause of indiscipline among secondary student. Various studies on the effect of miraa have been carried out worldwide. Miraa is a drug that is commonly used by people. Currently, Meru senator, Kathuri Murungi is set to table amendment bill seeking to remove miraa from classification of narcotic drug. In Gachoka constituency in Embu county miraa is commonly grown and used by people hence making this study essential. The objectives of the study were to identify the effect of chewing miraa on school dropout, to investigate the impact of chewing and plantation of miraa on school performance and to find how the chewing of miraa affect learners mentally. This study was limited to Gachoka constituency. The study employed a descriptive survey. A random sample was done of three secondary school in Gachoka constituency. Administering questionnaires to the student, teachers and interview was carried out randomly on the farmers in Gachoka constituency. The data was collected and analyzed,Test Retest method was carried out to confirm the reliability of the instrument. According to study findings, all the tested independent variable had a significant impact on students performance. The study therefore recommended for further studies in other schools in Embu.