Modification of the noradrenaline related effects of smoking by beta-blockade.

Increases in plasma noradrenaline were found in a group of 12 subjects smoking cigarettes. The associated rises in pulse rate, blood pressure and plasma free fatty acids could be prevented by beta-blockade with oxprenolol. This inhibition of the peripheral effects of catecholamines did not affect subjective satisfaction, indicating that central effects or other rewards are more important reinforcers. It is suggested that noradrenaline release in the hypothalamus is the final common pathway to pleasure in many situations, including smoking.