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Next they connected these joints to a smoke cycle simulator machine that uniformly inhaled six times for three seconds each, then exhaled. Filters collected the aerosols at the machines 3-D-printed mouthpiece, and the researchers used analytical chemistry techniques to measure aerosol levels from puffs taken at the beginning, middle, and end of each joint

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The data also indicated that the balance of mainstream smoke composition alters as the circumference changes

More importantly, there is a regulatory gap for nicotine-free e-cigarettes and herbal smoking products

doi:10.1056/NEJMra1502466