[brittonsmith]

The section in wikipedia that discusses this mentions that it is not clear that his employment by tobacco firms motivated his behavior: From wikipedia: 'To quote his biographers Yates and Mather, "It has been suggested that the fact that Fisher was employed as consultant by the tobacco firms in this controversy casts doubt on the value of his arguments. This is to misjudge the man. He was not above accepting financial reward for his labours, but the reason for his interest was undoubtedly his dislike and mistrust of puritanical tendencies of all kinds; and perhaps also the personal solace he had always found in tobacco."'

I believe this is thesis of the original article as well.

[DavidSJ]

There is still an open debate among statisticians as to whether employment of statisticians by tobacco firms causes statisticians to disbelieve in tobacco-caused cancer.