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This is sort of a two-parter question

When someone inhales nicotine, it reaches the brain faster than other methods, prompting a briefer and more intense buzz

For three anti-smoking advocateslocal physicians Richard Sargent and Robert Shepard, and activist and researcher Stanton Glantz from the University of California at San Franciscothis sudden drop in heart attacks was proof that smoking bans usher in extraordinary benefits for public health

To protect the health of the public, national and international health agencies evaluate many new and existing chemicals to determine if they are likely to be carcinogens in a process called cancer hazard identification