Source: Prescription for Nutritional Healing by Phyllis A. Balch, CNC and James F. Balch, M.D.
Every time a person smokes, he or she inhales over 4,000 different chemicals, including nicotine. Nicotine, which is extremely addictive, increases levels of the pleasure-inducing brain chemicals serotonin, dopamine, and norepinephrine. Tobacco has been used as a mood-altering substance for centuries. It has been ingested by various means, including chewing, sniffing, and smoking. Today it is most commonly consumed by smoking cigarettes. Read more.