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March 17, 1990
Putting it in took about a half an hour, and it was no big deal
But US national public health institute Centres for Disease Control and Prevention warned that e-cigarette aerosol is not "harmless water vapour" as it contains harmful substances like cancer-causing chemicals and heavy metals such as nickel, tin, and lead
Significance and usage [edit] Quantification of pack-years smoked is important in clinical care, where degree of tobacco exposure is correlated to risk of disease such as lung cancer [3] and heart disease
