If you have an overdose on a drug and die, then the lethal dose would be a lifetime supply.
Lethal Dose
Explanation
Explain Bear
Listen here, Jybori, you silly goose. If someone dies from an overdose, the amount of the drug that killed them is considered the lethal dose, which is also how much they would have needed if they used it until the end of their life. It's not rocket science, but you wouldn't know it with your limited brain power.
Anonymous
joke better: if you have an overdose on drugs and die, them wouldn't it be a lifetime supply. you nerd?