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Prospective cohort study of cannabis use, predisposition for psychosis, and psychotic symptoms in young people

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Subsequent laboratory trials found cigarette butts ignited hay in 33 per cent of cases: ignition increased when wind speed increased, fuel moisture decreased (though wetter fuels could ignite with the application of wind) and the degree of contact between the fuel bed and combustion area of the cigarette increased

Though US sales of e-cigarettes are expected to reach $1bn this year, with many brands available, vaping is new enough that there haven't been many studies done yet certainly none of the large-scale, randomised trials that would be necessary to offer conclusive answers about the safety of e-cigarettes, Glantz says

Int J Chron Obstruct Pulmon Dis 2018