"We have smoke in the cabin," he said. "We cannot find out the reason."
A repetetive, common feature of any smoke related incident is that the CAUSE of smoke can not be found.
Incident: Lufthansa A321 near Prague on Mar 14th 2013, odour in cabin
However the dangers of contaminated air from faulty bleed air systems is well understood from the 1950's; an accepted basic design flaw.
Surely it is long overdue to replace pilots noses with toxic air detectors - such that early action can be taken and prevent many others from being guinea pigs in the never ending debate as to 'Whether toxic oil fumes can cause serious ill health in a confined space?'
Who wouldn't want them installed?