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A new study suggests that some heavy smokers may be naturally protected from lung cancer due to efficient DNA repair mechanisms that limit mutations

Pharmacologic effects When humans, mammals, and most other types of animals are exposed to nicotine, it increases their heart rate, heart muscle oxygen consumption rate, and heart stroke volume

However, smoking rates in doctors and registered nurses are declining

While both deliver nicotine, they work through completely different mechanismsone burns tobacco at extreme temperatures, the other gently heats it

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