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Nicotine
Tobacco, Smokeless
Nicotinic Agonists
Smoking
Smoking Cessation
Psychomotor Performance
Tobacco Use Disorder
Substance-Related Disorders
Substance Withdrawal Syndrome
Blood Pressure
Heart Rate
Drug Dose Response Relationship
United States
Tobacco Industry
United States Food and Drug Administration
Tobacco
Toxic Plants
Double-Blind Method
Self Administration
Chewing Gum
Co-Publications
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20
15
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11
9
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5
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