Last smoking flight I was on was a macedonian flight ! It seemed that the plan was to smoke an enitre 200 carton, within the 2 hour flight, each.
My eyes have never (not even in pubs / clubs) been so sore as after that flight, and of course my clothes / skin / hair reeked when I got onto my connecting (non smoking) flight.
And I don't even smoke, apart from passively !