Objective: The aim of this study was to investigate quantity of environmental tobacco smoke (ETS) from husband and the risk of COPD in never smoking wife.
Methods: A study population aged over 40years and never smoking wife who have current or previous husband smoking enrolled in health checkup of COPD from May 2015 in Nagasaki Prefecture, Japan. They answered about the husband's smoking status and COPD questionnaire (IPAG) and performed spirometry. The index of ETS exposure from husband was calculated by number of cigarettes and years of smoking.
Results: Three hundred eight never smoking wives who exposed ETS (median: 432 [IQR: 210–800]) were included. Twenty (6.5%) subjects had IPAG > 16 point and FEV₁/FVC < 70%. The ROC curve indicated a cut-off point of 735 for COPD risk (sensitivity: 0.80, specificity: 0.78, AUC: 0.85, p < 0.001). Furthermore, the cut-off point remained significantly associated with COPD risk after adjusted confounding factor (OR: 13.12,95%CI: 4.11–41.86).
Conclusion: This result suggests that the index accurately discriminated for COPD risk in never smoking wives exposed by ETS.

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Objectives: This study investigated to clear the differences in smoking habits and education against tobacco between university students in Japan and China.
Methods: We carried out a survey into the smoking habits of students at Hokkaido University of Science in Japan and Shenyang Pharmaceutical University in China using a questionnaire.
Results: The percentage of participants in the study who smoke was 2.5% and 2.0% for Japanese and Chinese students respectively. The rate of smoking in Chinese students’ families was significantly higher than that of Japanese. Both Japanese and Chinese students understood the danger of lung cancer over any other smokingrelated diseases, but the extent to which the Chinese students’ understanding of other smoking-related diseases was significantly lower than that of the Japanese. Chinese students have taken lectures on education against tobacco was significantly lower than of the Japanese.
Discussion: The rate of smoking of the participants was low for both nationalities, however Chinese students have taken lectures on education against tobacco was significantly lower than of the Japanese. These results suggest that the education effect of China tends to be higher than one of Japan.
Conclusion: This study signifies the importance of education against tobacco in Japan and China.

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We analyzed questions related to passive smoking in social media. As a result, the questions about “the influenceof passive smoking on the beauty and health” were the most, suggesting the need to provide information on passive smoking.

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