Is Formaldehyde in Vapes? Sikary Vape Official Website Vapes don't produce harmless water vapor. They can contain addictive nicotine, cancer causing chemicals like acetaldehyde and formaldehyde, as well as heavy metals that don't belong in your body. Live Vape Free is TRUTH ABOUT VAPES! If vapes are supposed to be safe, why do they have toxic chemicals? Breathe in the truth, and learn the realities of what makes up a vape! This year, E cigarettes examined: Do they contain formaldehyde?