According to the American Heart Association, the risks of secondhand smoke from vapes are still being discovered. Learn about the dangers of secondhand smoke from vapes. Secondhand Vape Smoke Effects Vaping Produces Far Less Second Hand Nicotine Than Smoking Is Second Hand Vape Smoke Harmful Smoke Harmful Can Breathing In Secondhand Vape Cause Your Hemoglobin Many people assume vaping is harmless to bystanders, but secondhand aerosol can contain ultrafine particles and chemical residues. Researchers are examining how exposure may affect airways and overall health, especially for children