Introduction: Education for preventing drug abuse for younger generations is important in both local schools and families. However, owing to their sensitive nature, drug abuse issues are difficult to discuss outside school. This study explored the association between a class that provided guest lectures on preventing drug abuse and students’ conversations on drug abuse issues with their family and/or friends on that topic. Methods: We held a 30-minute class as visiting lecturers, speaking with students in grades 4-6 at an elementary school in Tokyo. We also conducted a cross-sectional questionnaire before and after the class. The questionnaire focused on whether the students spoke with anyone on the topic, with whom they spoke, and what were the topics of such discussions. Results: Answers were obtained from 127 students. Before the class, 30 students (24%) reported having engaged in some form of conversation on the topic. After the class within five days, 56 students (44%) reported having such conversations (P<0.05). The greatest number of students spoke with their mothers after the class, and mainly about the class itself. Discussion: The class therefore may have encouraged their conversations outside school on drug issues. Conducting education in elementary schools on preventing drug abuse is likely to create communication opportunities with family members on this topic.