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Exhalation valves let unfiltered air out, which is acceptable for personal protection but not ideal if you also want to limit spread of respiratory illness

No commercially viable and safer nicotine product was available, at least not one that delivered sufficient consumer acceptance to the extent they were willing to switch away from smoking

The agency was sued by manufacturers after it began intercepting e-cigarette shipments from China in 2008

Modeling the etiology of adolescent substance use: a test of the social development model

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