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One study detected the presence of nicotine (0.116.90 mg/mL) in 5 of 23 nicotine-free labelled e-liquids by nuclear magnetic resonance spectroscopy [35], and another study found nicotine (average 8.9 mg/mL) in 13.6% (17/125) of the nicotine-free e-liquids as analysed by high performance liquid chromatography (HPLC) [36]

When vaping, I seemed to draw in less air with Green Smoke than with the Halo G6

If you do want to get a little more in-depth, it does also offer PM10, PM2.5, and CO 2 readings, visible in smaller readouts around the AQI score

This is another air monitor that requires an app for you to see data, though I have to say it was the easiest setup I had while testing these devices