You wrote:We're told that the legal drug manufacturers calculate with a 40% placebo effect. A doctor-friend of mine claims that it's mostly placebo.
The exact effect of drugs is established subtracting the effect of placebos. Haven't you ever heard of double blind trials? Or control groups given placebos rather than the actual drug?
Modern drugs are more effective than placebos. To say otherwise would counter literally millions of studies, only young earth creationists and conspiracy theorists would be foolish enough to do that.
Placebos are still powerful. As is entertainment (a seperate effect to placebo-induced healing). Combining those two with proper drugs (which is exactly what is done in modern medical treatment) creates a very powerful healing combination.