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When the cigarette price increased due to consumption tax in April 2014, almost no anticipation effect was observed. After the onset of the price increase, a cluster of 27 days was detected.
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In 2010, a cluster period of 25 days before the date of the price increase was observed, suggesting an anticipation effect.
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Regarding daily RSV, the detected cluster size around the price increase in 2010 (52 days) was longer than that in 2006 (17 days). A spike in RSV preceding the enforcement of a cigarette price increase revealed an anticipation effect.Ä«etween 20, the three highest monthly RSV spikes were observed in July 2006 (RSV = 66), when cigarette prices increased by 11%, and in September (RSV = 90) and October 2010 (RSV = 100), when cigarette prices increased by 37%. Time periods within which the impact of search volume significantly increased were identified by cluster detection test, using daily RSV data. Using monthly RSV data, we evaluated possible relationships between the RSVs and tobacco control measures in Japan. Monthly or daily aggregated Google search volume for smoking cessation in Japan from 2004 to 2016 was collected in terms of relative search volume (RSV) ranging from 0 to 100. Our objective was to evaluate the duration of the impact of cigarette price increase in Japan using Google search data. Tobacco price increases can generate increased public interest in smoking cessation, but it is not clear how long this interest lasts.