Menthol inhalers

Bit of a deep cut, but I use these constantly (get chronic migraine headaches), and I find them really useful for flights even if I’m not dealing with pain. Almost like aromatherapy on steroids? I like that they’re discreet to use and then easy to tuck away (they’re the size of a Chapstick). There are other brands, too, but I’ve had good experience with the Boom Boom mint varieties.