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But metal knives, pocket knives, and Swiss army knives are not allowed

While some smokers may have caused irreversible damage to their lungs, quitting smoking will always lead to improved lung function, even if they never return to how they were before smoking

In vitro studies of different nicotine products are required to better understand the inflammatory profile and underlying mechanisms of mucosal lesions

"There've been few studies that investigated the extent of biological effects," says Jake McDonald, PhD, director of Environmental Respiratory Health Program and the Chemistry and Inhalation Exposure Program at Lovelace Respiratory Research Institute in New Mexico