Don't Be Fooled: Vaping Is Just as Dangerous as Cigarettes Vapes on black market may contain toxic chemicals, pesticides, harmful flavorings INFOGRAPHIC: How Dangerous Are E Cigarette Ingredients? 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. Vaping can silently destroy your body, damaging multiple organs without you realizing it. Each puff delivers a mix of nicotine, propylene glycol, glycerin, heavy metals, and flavoring chemicals that slowly corrode your