THCa Vape Pens: Benefits, Risks, and Safer Use Guidelines Weed coming on too strong? Dosing is intended to give vapers control over their cannabis Los Angeles Times Marijuana and Your Lungs: Is Vaping Safe for People with COPD? Impacts of vaping and marijuana use on airway health as determined by exhaled breath condensate (EBC) Respiratory Research Springer Nature Link Secondhand Smoke and Electronic Cigarette Aerosols US EPA