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[54] The inhaled substances trigger chemical reactions in nerve endings in the brain due to being similar to naturally occurring substances such as endorphins and dopamine, which are associated with sensations of pleasure

Cahill, K

Thus, tachycardia and rise of blood pressure are to a large extent the consequence of sympathetic ganglia activation that induces an increased adrenaline release in the adrenal medulla (via splanchnic nerve stimulation)

This discovery explains why nicotine and other drugs that produce rewarding feelings can be a first step toward addiction

Tobacco companies have introduced almost no new cigarettes or smokeless tobacco products in the U.S