Secondhand smoke and secondhand aerosol The Dangers of Secondhand & Thirdhand Smoke Exposure Ever puffed a vape around others thinking it's harmless? Think again. Inhaling vapor from e cigarettes exposes you to harmful chemicals, such as formaldehyde. These toxic substances can be passed on to Chemicals Secondhand vape exposure: Risks and side effects Vaping: The Smoke Free Habit That Isnt Risk Free, PALS Community Magazine, So vapes. They smell like bubblegum, look like highlighters, and somehow cost more than a weeks groceries. But whats