Tobacco plants are grown in more than 100 countries around the world.Tobacco contains a chemical called nicotine that when ingested gives the consumer a "pleasurable rush" and as a consequence people from all over the world have been addicted to this plant for centuries. Nicotine stimulates the release of adrenaline in the brain and this is the rush or nicotine "hit". Tobacco is most commonly ingested by inhaling the smoke from burning it. Tobacco is burnt using a cigarette, cigar or pipe. It can also be chewed in the form of chewing tobacco or snuffed. Consuming tobacco is associated with a wide array of negative health consequences.

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