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yes, that's about half the LD50 for humans. Definitely more than you would consume as a non-addict on a regular day.

A cup of drip coffee is what, 90mg? (Source: https://www.coffeechemistry.com/chemistry/alkaloids/caffeine...) So 100 mg/kg would be 70-90 cups of coffee. I'm wired after 4-6 cups.