I was invited by RTHK Radio 3 in Hong Kong to take part in a discussion about smoking and whether it should be banned in all outdoor areas.
It would be broadcast live, they said, between 8.30 and 9.00am, which translates as 12.30 to 1.00am in the UK.
That was last night. In the event the discussion went on until 1.30. It was prompted, they said, by an article in a Hong Kong newspaper headlined 'Workers face demands for smoking ban outside offices'.
My fellow guests last night were Prof Lam Tai-hing, quoted above, and Dr Kwok Ka Ki. Honestly, there was no debating with these people. As far as they are concerned tobacco smoke is toxic and even the slightest exposure is dangerous to non-smokers.
The presenters tried to play devil's advocate but refused to accept anything I said about passive smoking because I am not a "medical expert", unlike Dr Ka Ki and Prof Tai-hing.
My argument that we shouldn't believe everything we hear from so-called "experts" fell on death ears. Talk about banging your head against a brick wall.
All in all, it was a rather tiring way to end a long day.