Tobacco use and tobacco‐related cancer risks in migrants in Europe

International migration is increasing and Europe is no exception with immigrants accounting for more than 10% of the total European Union population in 2014. One pressing issue is tobacco use in immigrants as they may use tobacco differently from the natives of the hostcountry and this could result in differing tobacco‐related cancers (TRC) risks compared to those in the natives. However very little is known about tobacco use, a major avoidable cancer cause, and TRC in immigrants in Europe. The overall objective of this thesis was to investigate tobacco use and risk of TRC in immigrants. The aims were to: explore tobacco use and its determinants in immigrants in France (TOBAMIG pilot study), compare the burden of TRC between immigrants and natives in Denmark, put these results into context with current knowledge, and give guidance on how to set up a study on tobacco use and cancer risk in immigrants in France using the experience from the TOBAMIG pilot study. In the TOBAMIG pilot study information on tobacco use and its determinants was collected from a mixed sample of immigrants, suggesting a large‐scale study was in principle feasible, but modifications from the TOBAMiG approach were to be made. In Denmark, the overall TRC rate in immigrants was lower than that of the natives; however, large differences were observed by cancer‐site and by country of origin, suggesting that among other factors the smoking patterns from the immigrant’s country of origin have a primary role in the burden of TRC. Finally, with regard to a large‐scale study in France, two study designs are proposed, depending on the quantity of information sought, to better understand tobacco use in immigrants and risk of TRC