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doi:10.3390/ijerph120809988

The HPLC system consisted of a 1525 Binary HPLC Pump with a 2996 Photodiode Array Detector (Waters Inc.)

Cigarette alternatives such as nicotine patches and e-cigarettes are not widely available and remain unpopular, providing no competition to Vietnamese cigarette brands which, at less than $1 per pack, are among the cheapest in the world

Their findings were published today in a Cochrane Review

Calculating pack years provides a standardized way to measure the cumulative impact of smoking over time