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48 A recent study by Reidel et al showed that induced sputum from smokers of electronic cigarettes had similar levels of the airway mucin MUC5AC as the induced sputum of cigarette smokers
Thats a bit of a gray area

Green Smoke is our latest Editors' Choice for prefilled electronic cigarettes

The findings come ahead of World No Tobacco Day, observed annually on May 31

275276: "Lady Madonna", MacDonald 2005, pp
