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stuffy nose from smoking cigarettes How Causes Nasal Congestion and Sinus Issues? How Smoking Affects Your Sinus
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In a majority of cases, they were successful at quitting conventional cigarettes

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We have staff in our office who smoke

In these responses, they looked for daily or almost-daily users of either e-cigarettes or cigarettes

There are both short- and long-term advantages of not smoking

Could some systematic difference between baseline and follow-up have biased the estimates of change from these studies, studies which contributed substantially to the lower estimates associated with longer-term quitting, and the lower weighted than unweighted overall estimate