Caffeine is the most common, normalized stimulant in the world, with many people consuming caffeine daily.

According to Ron Cotterel, M.D., M.S., a family medicine and integrative family physician, caffeine is the most popular stimulant worldwide — and one of the most frequently misused addictive substances. According to the Food and Drug Administration, eight out of 10 adults in the United States are daily coffee drinkers.

Caffeine is highly addictive and oftentimes when people go a day without it, they experience withdrawals and side effects. These symptoms can include severe headaches, irritability, muscle aches, drowsiness and sometimes nausea. This results in a physical dependence on caffeine.

Caffeine can also have more severe side effects, such as temporary rises in blood pressur

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