A gentleman calling himself The Clunking Fist weighs in...
I'm sure Mr Worstall thought he was awfully brave.
"... the dangers of passive smoking have been hugely overstated is one thing," starts Worstall. Mr Worstall hasn't, evidently, heard of sidestream smoke, predominent in passive smoking, "four times more toxic than mainstream smoke" and "contains much higher levels of many of the poisons and cancer-causing chemicals in cigarettes." (cancerresearch.org).
Mr Fist is obviously unaware of the blogger etiquette that says that if you are going to cite some facts or figures—especially scientific ones—one should actually link to the article in question.
Unfortunately, Mr Fist doesn't do so and, having searched for those exact sentences on the cancerresearch.org site, I cannot be bothered to trawl through the many documents that that exact sentence, about "much higher levels of poisons", brings up.
However, I would like to point out to Mr Fist that the levels of cancer caused by passive smoking were found to be "statistically insignificant". By those clean air fanatics in the US of A, no less.*
Here, I'll let Penn and Teller explain this particular piece of Bullshit.
Plus, of course, Mr Fist also misses the point that pubs are, in fact, private property.
Is Mr Fist another Neil Harding, we wonder?
* Oh, and by the way, this doesn't mean that I think that sitting in a smokey atmosphere is good for anyone: I don't. All I am pointing out is that, despite the "concensus" (you all know how I love that word"), the actual, concrete evidence is scanty to say the least.