Banned Dangerous Vape Ingredients to Avoid in Your Vape Juice California lawmakers have refused to restrict flavored vaping is that about to change? CalMatters Harmful Chemicals in Vapes and E Liquids You Should Avoid SMOKO E Cigarettes It's official. Flavored e cigarettes cause permanent lung damage. And doctors are already seeing it happen. In the United States, a teenager developed something called popcorn lung after secretly vaping for three years.