is chewing tobacco addictive smokeless safer than cigarettes? 7 Surprising Ways Nicotine Impacts
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But word spread that you could get nicotine without the leaf

Some of these products, such as pouches and many discs and chews, are placed between the lip and the gum, where the nicotine is then absorbed, after which the user removes and throws away the pouch
One approach that has been suggested for collecting more refined and more accurate self-reports of smoking is the Time-Line Follow-Back (TLFB), which asks subjects to retrospectively report daily cigarette consumption day-by-day over some period of time

In: How Tobacco Smoke Causes Disease: The Biology and Behavioral Basis for Smoking-Attributable Disease: A Report of the Surgeon General