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Yep, that pesky chemical in cigarettes is to blame

The effect of smokeless tobacco consumption in oral microbiome composition was also investigated by identifying differentially abundant genera in oral buccal site of smokeless-tobacco-consuming and non-consuming healthy individuals

doi: 10.1053/j.sult.2020.08.011 48 MekhoraCLamportDJSpencerJPE

These include: Annual domestic e-cigarette sales targets, based on a variety of considerations, including tobacco control, market demand, economic development, demographic changes, and market conditions

For official guidelines, you can check the Canadian Air Transport Security Authority: Can You Bring Cigarettes on International Flights

Tips for Reducing Nicotine Intake Reducing nicotine intake can be a step toward quitting smoking altogether