I think I read somewhere that he took speaking fees from tobacco and amphetamine companies and wrote positively about them.
But calling a pharmaceutical company an "amphetamine company" seems a bit obtuse. For one, amphetamines are commonly prescribed by doctors and are used to successfully treat a lot of serious problems with patients. Secondly, those companies makes lots of other drugs too.
But I guess it doesn't sound as bad if you say he accepted money from "insulin companies".