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If you quit tobacco after purchasing a policy, you can request a rate reconsideration after meeting the tobacco-free period requirement (typically 12-24 months)

Keep in mind that your only other allowed carry-on bag will be a personal item that fits under the seat in front of you

Heres a look at how some regions handle this issue: European Union : The EU has stringent regulations on smoking and the use of tobacco products on flights

Its not easy, but its not all doom and gloom

Electron-spin resonance study of mainstream and sidestream cigarette smoke: nature of the free radicals in gas-phase smoke and in cigarette tar