The prevalence and determinants of substance usern(alcohol, khat, cigarette), mental illness, suicidalrnattempt, STDs and teenage pregnancy among adolescentsrnaged 10-24 years have not been well documented in therncountry. A community based cross-sectional study wasrnconducted in Awassa Zuria Woreda, southern Ethiopia fromrnNovember to December 1994 G.C. A total of 1953rnadolescents were included in the study. Data wererncollected using questionnaire by trained interviewers.rnThe likelihood of substance (alcohol, Khat,rnCigarette) use on average was at leas t two times higherrn(p