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[2] Some users of electronic cigarettes modify their devices to inhale large amounts of vapour at once, to exhale "clouds" in patterns like smoke rings

df= 1, 111

E-cigarettes versus nicotine replacement treatment as harm reduction interventions for smokers who find quitting difficult: randomized controlled trial

We also found all e-liquids contained substances for which the health effects of inhalation exposure are unknown

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Mobile phase A consisted of 0.01% NH4OH in water and mobile phase B of 0.01% NH4OH in methanol with a gradient starting at 5% mobile phase B which linearly increased to 90% B at 2 min and to 100% B at 2.5 min