You are correct. Oddly Fentanyl is a very good drug used properly and legally in hospital settings and even rarely in non hospital settings for terminal control of pain.
The reason for the huge increase in illegal use of fentanyl is its extreme potency. A very small package can be millions of doses for addicts, thus it is much easier to smuggle. In addition it is manufactured by a simple chemical synthesis as opposed to heroin which is derived from the poppy plant.
Many years ago Singapore had one of the worst drug problems in the world. They solved it. If you use drugs you will go to prison for a relative short but very brutal stay. If you sell drugs we will hang you regardless of your nationality. We do this quickly and efficiently. Singapore does not have a drug problem today.
cpdiii pharmacist