This chart has one misleading bit. You don’t really overdose from cocaine. The vast majority of deaths from cocaine occur from an impossible-to-predict fatal heart rhythm. You snort some coke and your heart stops beating normally and you die. Cocaine is an interesting drug in that this rhythm can occur in anyone at any time and it’s not associated with the dose. It can happen the first time you do coke or the 1,000th. It can happen with just a small amount or it can happen after your 4th hit that night. It’s just sheer bad luck. Note that cocaine kills more people than heroin every year.