Are they safe to inhale?': Vaping liquids in Canada contain potentially harmful chemicals, tests show CBC News What Is in Vape Juice? Vape Juice Ingredients Explained Vape and Go 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. Vape Juice Safety: Ingredients, Health Risks, and Truth Ecigator Myth: Vaping is harmless. Fact: Vapes contain nicotine and other chemicals that can harm your lungs and make it harder to quit for good. In California, vapes are now one of the What Is Nicotine & How It Benefits People? [A highly ignored subject]