From the transcript (
http://sites.google.com/site/qitranscripts/transcripts/1x10) - just the tidbit about 6% savings in fuel cost just by reducing airflow sounds completely implausible:
"Stephen
Well, the question is . . . It was almost certainly a bad idea, erm . . . It was a lousy idea, in fact, 'cause when smoking was allowed, the cabin air was completely replaced with fresh air every three minutes, and now, the airlines save money . . . they save up to 6% of their fuel bills by using a mixture of fresh and recycled air--
Julia
And SARS.
Peter
Ohh.
Stephen
--yeah . . . using under half the amount of fresh air needed for comfort; increasing the amount of carbon dioxide in the cabin; causing dizziness, and nausea, and allowing viruses to thrive. Passengers think that, because they can't smell smoke, the air is fresher. This is not so. Apart from anything else, it has dramatically increased the number of air rage incidents. One of the earliest reported incidents of air rage involved a passenger in first class, probably trying to take his mind, erm, off cigarettes, by drinking too much, and he was refused another drink, and so he decided to lodge his displeasure, and shat on top of the food trolley.
"
While Patrick Smith may not be an air conditioning expert, as a pilot he's required to know how the AC systems work and how to operate them, and if there was a widespread modification to AC systems or pilot procedures after the smoking ban, I'd expect him to know about it and mention it in the article.