why can i smell cigarette smoke when there is none Thirdhand smoke' may last longer than you think, damage your health Smelling Smoke When There Is
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I think this goes without saying, but flammable liquids, gels, gases, and other items that could easily ignite are too dangerous to take on an airplane

Smoking increases the risk of uveitis by disrupting the immune system and increasing inflammation in the body, potentially leading to vision loss if not treated
Kollins SH et al (2009) Effects of postnatal parental smoking on parent and teacher ratings of ADHD and oppositional symptoms

For those who arent familiar with the term, secondhand smoke comes off the end of a cigarette

Office on Smoking and Health (US)