"Keep it a secret": leaked documents suggest Philip Morris International, and its Japanese affiliate, continue to exploit science for profit.

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The tobacco industry has a long history of manipulating science to conceal the harms of its products. As part of its proclaimed transformation, the world's largest tobacco company, Philip Morris International (PMI), states it conducts "transparent science". This paper uses recently leaked documents from PMI and its Japanese affiliate, Philip Morris Japan (PMJ), to examine its contemporary scientific practices. 23 documents dating 2012 through 2020 available from Truth Tobacco Industry Documents Library were examined using Forster's hermeneutic approach to analysing corporate documentation. Thematic analysis using the Science for Profit Model was conducted to assess whether PMI/PMJ employed known corporate strategies to influence science in their interests. PMJ contracted a third-party external research organisation, CMIC, to covertly fund a study on smoking cessation conducted by Kyoto University academics. No public record of PMJ's funding or involvement in this study was found. PMJ paid life sciences consultancy, FTI-Innovations, ¥3,000,000 (approx. £20,000) a month between 2014 and 2019 to undertake extensive science-adjacent work, including building relationships with key scientific opinion leaders and using academic events to promote PMI's science, products and messaging. FTI-Innovation's work was hidden internally and externally. These activities resemble known strategies to influence the conduct, publication and reach of science, and conceal scientific activities. The documents reveal PMI/PMJ's recent activities mirror past practices to manipulate science, undermining PMI's proclaimed transformation. Tobacco industry scientific practices remain a threat to public health, highlighting the urgent need for reform to protect science from the tobacco industry's vested interests.Implications: Japan is a key market for PMI, being a launch market for IQOS and having the highest heated tobacco product use globally. Our findings, in conjunction with other recent evidence, challenge PMI's assertion that it is a source of credible science and cast doubt on the quality and ethical defensibility of its research, especially its studies conducted in Japan. This, in turn, brings into question the true public health impacts of its products. There is urgent need to reform the way tobacco-related science is funded and conducted. Implementation of models through which research can be funded using the industry's profits while minimising its influence should be explored.