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At best, you only absorb about 50% of the nicotine, which equates to 2 or 3 mg

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Smokeless tobacco causes cancers of the oral cavity, esophagus and pancreas, the CDC says

They can be handcrafted from various types of wood, such as briar, cherry, oak, or rosewood

Train hoppers in the Midwest and other corn-growing areas would find themselves in the presence of this abundant crop, often just off of the train tracks

For further general health information, you may refer to this comprehensive source: Wikipedia: Health