...in the anti-smoking movement, you don't need to be honest and truthful. As long as your intentions are good, you can get away with lying and with making false and defamatory accusations. The ends are all that matter, and if you use defamatory means to reach those ends, it's perfectly acceptable.
And he's in the anti-smoking movement!
The subject of his blog post is the latest lies being spread by the Laurel and Hardy of tobacco control, Simon Chapman and Stan Glantz. Go read it.