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This column, which appeared for several years in the Post-Dispatch, looks at scientific issues and explains them in an accessible manner

Nicotine in vapour is primarily absorbed in the oral cavity and upper respiratory tract, while cigarette smoke introduces nicotine right into the lungs for faster absorption in the bloodstream

In contrast, vaping delivers nicotine rapidly through inhalation , leading to a quicker onset of effects

Designed for convenience and safety, the built-in noise-canceling microphone and dedicated call button make it easy to answer or end calls with a single touch, allowing you to keep your focus on the road

Despite this, many people still smoke because they are addicted, and find it hard to quit