Objective: To determine the prevalence of excessive alcohol intake (EAI) and cigarette smoking (CS) in schoolchildren of Brazzaville. Methods: This cross sectional survey included a representative population of schoolchildren in Brazzaville (603 schoolchildren divided 325 girls and 278 boys). Results: The prevalence of EAI was 9% (n = 54). The mean age of EAI children was 16.2 ± 1.3 years (range: 13 - 18 years) vs 11.4 ± 3.4 years (range: 5 - 18 years) for no EAI children (p Conclusion: Low social level, siblings, addictions in parents were correlate addictions in schoolchildren. It is necessary to prevent the acute and futures complications of this addiction in our children.