The Parat C mentioned on Pprune was designed for evac from Hotels and buildings rather than smoke filled aircraft, smoke hoods fitted to commercial & indeed military aircraft (we fittted them to the RAF C-130 fleet) have chemical O2 generators in them, they may only be carried on board for the use of the crew and then only after training in their safe operation, the passengers cant use them, they are also banned from being carried as cargo, including on cargo only flights because they are Haz mat, even when carried as road freight, they have to be packed in an exact fashion that will limit the spread of fire should they combust and they do combust in rather "explosive" fashion.
The best bet, also as a frequent flyer, is to either sit in the exit row, or if that's not available, count the rows either in front or behind you to the exit, that way, if there is a survivable smash and the cabin is filled with smoke, you can count the rows to the exit, even if you are blinded, bearing in mind you will probably also be climbing over bodies and all sorts of cabin & structural fixtures.
The best bet, also as a frequent flyer, is to either sit in the exit row, or if that's not available, count the rows either in front or behind you to the exit, that way, if there is a survivable smash and the cabin is filled with smoke, you can count the rows to the exit, even if you are blinded, bearing in mind you will probably also be climbing over bodies and all sorts of cabin & structural fixtures.