Thanks for the info yyz-den. Much appreciated. I never thought of the AC or of possibly buying some gum for myself.
I agree that many passengers must become irritable and grouchy due to wanting a cigarette and that this must contribute to bad behaviour on flights.
I've always enjoyed my visits to YYZ and in February while it was snowing I was probably the only person walking the streets at 5:00pm.... Of course, the locals were using your excellent underground tunnel systems to get around.