Yes, indeed, one would desire a well ventilated environment....Thank you for the information

I generally cook with my MSR Pocket Rocket or various Esbit or alcohol contraptions when I really want to go light. However, there are times when any kind of flame is a no-no. One would be the aftermath of an earthquake,with many disruptions, including ruptured gas lines. Another would be those times in the western US when the forests become tinder dry, and open flames are banned. Of course, those are also good times to eschew hiking and launch the sea kayaks.

I project a flameless cooker or two as a nice backup to conventional methods, handy for special circumstances. It will be interesting to see how well the unit works...

BTW, just how much is a "quid" (the monetary unit, not the thing you chew).....?