Why have you never tried heroin? I am struck by how often the response to that question is not "because it is illegal".
Remember, opiates are legal now, with a prescription.
I wonder, hypothetically if there was a drug where the effects were as pleasurable as I assume heroin must be, but with no physical addiction or nasty side effects, would people still be against it?
What if, in the future, your cellphone could emit a frequency that generates pleasure in your brain, but as soon as you turn it off, you are back to normal. Would that be made illegal?
Could it be simply a moral objection to unearned pleasure that people are really against?