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Introduction We found no comprehensive studies on the location of transnational tobacco and leaf company (TTLC) subsidiaries (business entities they control) or the consequences of their presence on health policy. Aims and Methods Here we assess (1) the global reach of TTLCs by mapping their tobacco growing and manufacturing subsidiaries and (2) the relationship between in-country presence of the tobacco industry and their power and interference. Data on subsidiaries were collated through systematic searching for countries' supply chain activities in documents and web pages. Cross-sectional multiple regression analysis was used to assess the association between the number of agricultural and manufacturing TTLCs and the Tobacco Industry Interference score, and the degree to which these were mediated by tobacco control, good governance, and economic importance of tobacco. Results TTLC supply chain activity had global reach. As the number of TTLCs with tobacco growing and manufacturing activities rose, interference increased significantly. Interference was associated with poorer tobacco control. The association with more TTLCs undertaking final product manufacturing was related to higher-value tobacco exports but was not related to tobacco making a bigger contribution to the economy. Conclusions TTLCs continue to control the global tobacco supply chain through their globe-spanning subsidiaries. The presence of TTLCs in a country is associated with political interference. Countries should consider their participation in the tobacco supply chain alongside the understanding that they are likely to cede political power to TTLCs, potentially undermining the health of their populations. Implications Tobacco control research has traditionally concentrated on the demand side of tobacco. Our results lend support to calls for more research on the supply of tobacco. Governments should require tobacco companies to provide detailed, up-to-date information in an easily accessible format on in-country supply chain activities. Policymakers should take the likelihood of political interference in health and environmental policy into account when making decisions about foreign direct investment offered by the tobacco industry. [ABSTRACT FROM AUTHOR]