A lethal dose of chocolate for a human being is about 22 lbs., or 40 Hershey bars.
Chocolate is definitely bad news in quantity. It contains high levels of theobromine, a powerful stimulant of the central nervous system. Theobromine poisoning can cause heart failure, seizures, acute kidney damage and dehydration. A lethal dosage of chocolate for a human being is about 22lb (or 40 bars of Dairy Milk). On the other hand, one Smartie would be enough to kill a robin or a blackbird.