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"Just as with the 'hard' drugs of abuse, such as heroin and cocaine, the phenomena of pleasure, addiction, increased tolerance and craving from tobacco are firmly rooted in neurochemistry." The research will be presented Tuesday in San Diego at the annual meeting of the Society for Neuroscience.

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It was concluded that the activities of the radioisotopes of radium, 226 Ra and 228 Ra in the tobacco leaves reflected their origin from the soil by root uptake rather than fertilizers used in the cultivation of tobacco plants

International Journal of Behavioral Medicine