Does vaping indoors cause mould and stains on the wall? Cumnock Chronicle Engine heat, vape residue, and a well placed headlight made a cool little pattern on my windshield. What is this!? , Vaping is horrible for your health, and you should quit it today, While we cant be entirely sure if this is actually vape residue, it is illustrative of what is happening in your Vaping leaves behind a toxic residue on your couch, clothes, or carpet could be affecting your heart health. A new study found that toxic thirdhand chemical residue from vapes caused