Why would a doctor promote Heroin? If they would, especially for recreative purposes, would be very much at odds with any medical ethics. What is clear via Oxy example is that medical ethics really need to be upheld and profit taken out of the equation.

Do you see doctors promoting cigarettes? Alcohol?

I would say that your reasoning why you aren't doing CBD is highly rational. Do you really think that even if you wanted to try heroin and if you did it, it would automatically addict you? Like you're instantly gone in to the abyss?

People try heroin and nothing happens to them. Some even hate the experience. People use heroin for prolonged periods and then simply stop (non unusual in the late teens, with some kind of a trigger in the mid 20).

If there was not so much stigma involved and so much risk taking the stuff, we might see people coming out of this juvenile experimenting phase in a much much better state.

Also, do you really think that people that lifelong addicts, don't have some kind of deeper psychological reasons to go down that path?