Ahhhh, no but I've extracted using Nitrous Oxide cartridges to compress an EtOH QWET extraction in a Selzer bottle. It made some nice concentrate but alas the sample never made it to the lab.
Everyone agreed it was marvelous stuff and a joy to gaze upon, but I couldn't personally tell any difference between it and regular QWET subjectively.
After a 3 minute soak at -18C/0F, we discharged the Nitrous Oxide into a balloon and passed it around as well. It was ragged on my lungs when I inhaled it, and I was already pretty happy, so not sure about any effects there except for the coughing.