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10 Addictively Dangerous Yet Legal Drugs

2. Caffeine

If you suffer from early morning irritability and jitters before you gulp down your morning coffee, you know what caffeine addiction feels like. In fact, medical studies estimate that roughly 30-percent of American’s are dependent on caffeine and would suffer withdrawal symptoms if they had to quit the stimulant cold turkey. While up to 4-cups of coffee (or 400-milligrams of caffeine) is safe for the average healthy adult, caffeine in excess (more than 500-miligrams per day) can result in insomnia, accelerated heart rate, anxiety, and mix dangerously with other medications.

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