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Heated tobacco products (HTPs) were introduced in Japan in 2014 without sufficient scientific evidence about the associated health risks. Our previous report found substantial HTP use in Japan after 2016.1 This study aims to clarify how the prevalence of HTP use (IQOS, Ploom TECH and glo) has increased over the last 5 years in Japan using ongoing retrospective Japan ‘Society and New Tobacco’ Internet Survey (JASTIS) data.
We calculated the prevalence of HTP use from 2015 to 2019 from the JASTIS dataset. At baseline in 2015, 8240 participants aged 15–69 years were randomly selected from a Japanese large internet search agency, Rakuten Research.2 Adjusted estimates using inverse probability weighting (IPW) obtained from a propensity score (calculated by logistic regression models using basic demographic and socioeconomic factors) were calculated to correct for the selectivity of internet-based samples, using a probability sample that is representative of the Japanese …
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