fatal levels

Heroin….Depending on purity and the user, a lethal dose of heroin may range from 200 to 500mg, but hardened addicts have survived doses of 1800mg and over.

Caffiene…..Extreme overdose can result in death.The median lethal dose LD50 of caffeine in humans is dependent on weight and individual sensitivity and estimated to be about 150 to 200 milligrams per kilogram of body mass, roughly 80 to 100 cups of coffee for an average adult taken within a limited time frame that is dependent on pharmacological half-life.

Chocolate…unspecified