Do you know what you're vaping? Propylene glycol (PG) and vegetable glycerin (VG) are the main liquids in vapes. When heated, these chemicals turn toxic and aren't safe to breathe. TSA Guidelines: Can You Bring A Vape On A Plane? Higher Grade Store Flying with vaping devices, batteries and liquid refills? All electronic devices and vape batteries must be placed in your carry on baggage. Liquid refills are limited to quantities of 100ml or less and Can You Bring Disposable Vapes on a Plane? PG vs VG Vape Juice: Differences and Best Ratio Guide Best Eliquid 2026 UK: Top E Liquid Brands & Flavours