1. Tobacco
Found in tobacco products, nicotine is a highly addictive substance. Approximately 50 million people in America are addicted to some form of tobacco product, making it the most common addiction in the US. The addiction to nicotine is down to the way it’s processed by the body. When smoke enters the lungs, the nicotine is quickly absorbed in the blood and delivered to the brain, activating the brain reward system. These effects dissipate quickly, so the user continues to maintain the pleasurable effect, reinforcing the physical desire to smoke. With tobacco being widely available and only 6% of smokers able to quit in a given year, nicotine addiction isn’t going anywhere anytime soon.
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