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These deaths may occur when carbon monoxide released from combustion builds up in an enclosed space, which can result from ventilation failures in indoor natural gas burning equipment or running gasoline generators or automobiles indoors or in a closed garage

Acute impact of tobacco versus electronic cigarette smoking on oxidative stress and vascular function, CHEST, 150 (3), 554-562

Human lung cells grown in tissue culture are commonly used to study the effects of e-cigarette vapor on living cells in research labs, but thats obviously not possible in a classroom, said Cassidy-Hanley

however, views on safety and regulations on e-cigarettes vary widely

Higher taxes, regulations on smoking and information for consumers could avoid at least 115 million smoking-associated deaths in the next few decades, including around 25 million cancer deaths