In modern pharmacology it's so clear that even if you have a fixed dose of a drug, the individuals respond very differently to one and the same dose.
“I am an American. Black. Conservative. I don't use African-American, because I'm American, I'm black and I'm conservative. I don't like people trying to label me. African- American is socially acceptable for some people, but I am not some people.”
“Realism is a bad word. In a sense everything is realistic. I see no line between the imaginary and the real.”