Funny, father of modern scientific statistics R.A. Fisher, after pouring over various statistical anomalies of the antismoking data, found it didn't quite add up.
Fisher's Smoking: The Cancer Controversy
Let's get it out of the way:
"B-but he smokes!"
"B-but he works as a tobacco consultant"
Refute the work, not attack the character based on emotions. If anything, explain how, the Surgeon General is correct, with all its correlation = causation sleight of hand tricks, because they don't add up.