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Dunn, one of Philip Morris' lead researchers from the 1970s said in an internal company conference, "No one has ever become a cigarette smoker by smoking cigarettes without nicotine." Here's how it works: When you inhale cigarette smoke, the nicotine inside the cigarette travels into your lungs, where it gets absorbed into the bloodstream and carried to the brain in seconds

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Instead, some elevated risk persists for years after quitting, particularly among individuals with a history of heavy or long-term smoking

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