Many poisons have a very thin line between "effective" and "lethal dose". Even aspirin can give you liver damage if you take merely one or two pills more than the recommended daily dose, if you're a smaller person.
If they're hardcore addicts, they've developed a resistance and take both more to get a high, and to be injured from too much. But if they're small, the dosage must also be less. Balance it out with pen and paper, and make sure the crackhead knows to not take two hits in X hours, it's honestly surprising to me that so few are suddenly keeling over.
Many poisons have a very thin line between "effective" and "lethal dose". Even aspirin can give you liver damage if you take merely one or two pills more than the recommended daily dose, if you're a smaller person.
If they're hardcore addicts, they've developed a resistance and take both more to get a high, and to be injured from too much. But if they're small, the dosage must also be less. Balance it out with pen and paper, and make sure the crackhead knows to not take two hits in X hours, it's honestly surprising to me that so few are suddenly keeling over.