Still loving my innokin Coolfire IV and my MVP 3.0 Pro 60W!
From www.innokin.com. It looks like there's a medical test that shows the difference in lung cells exposed to vapor as compared to cigarette smoke. It was performed by a tobacco company, but I'm sure that the medical community has vetted the process closely to make sure the tobacco company hasn't produced a bias testing process.
Airway test reveals e-cigarette vapor produces similar result as air - Innokin
From www.innokin.com. It looks like there's a medical test that shows the difference in lung cells exposed to vapor as compared to cigarette smoke. It was performed by a tobacco company, but I'm sure that the medical community has vetted the process closely to make sure the tobacco company hasn't produced a bias testing process.
Airway test reveals e-cigarette vapor produces similar result as air - Innokin