Do Vapes Have Sugar? The Truth About Sweeteners and Vaping Can Diabetics Vape? Here's Everything You Need to Know 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. Sugar Pie Vapes E Liquid Review E Cigarette Reviews and Rankings Sugar Pie Vapes E Liquid Review E Cigarette Reviews and Rankings Vaping Safety, Effect on Blood Glucose