Before 1970, doctors used to lie to their patients all the time. They knew that some hypochondriacs became noticeably better when doctors gave them a sugar pill.
This was called "the placebo effect." After 1970, we thought of placebos differently. Researchers decided that for a drug to be deemed effective, it had to outperform a placebo. But we never stepped back and took a good hard look at the placebo and why it worked.