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Another limitation is that we asked for current and not previous e-cigarette use, nor the duration of e-cigarette use

With the deepening of international integration, the competitive pressure in the industry will increase in the domestic market and the export market

Once the sample is collected, it is processed and analyzed using specialized techniques to quantify the cotinine levels present

In most cases, the levels of toxins inhaled from e-cigarette vapor are very low and unlikely to cause long-term harm (Royal College of Physicians, 2016 pg

You seem to be trying to find something to ask, Mr
