It's Not Just Cigarettes: Vape Residue Sticks on Surfaces Too Thirdhand Smoke Resource Center Secondhand Exposure to E Cigarettes Puts COPD Patients At Risk Respiratory Therapy Secondhand Smoke Vermont Department of Health Can Smoking and Vaping Cause Back Pain? National Spine Health Foundation Solving secondhand "vape smoke" at workand at home Secondhand vape plumes could form lung damaging radicals American Chemical Society