Read today that Nitrous Oxide (or laughing gas) has been discovered to have possible harmful effects and it has been recommended to drop it from general use.
Apparently, "it doubles the rate of serious vomiting and pneumonia after surgery and raises the risk of wound infections.
"Their study of 2050 patients also showed that those who had undergone surgery were slower to recover and likely to stay in hospital longer if gases used to keep them unconscious included nitrous oxide as a base, rather than oxygen alone or oxygen and air."
"Because it changed the way the body metabolised vitamin B12 and folate, it was also possible nitrous oxide could cause immune system and heart problems, nerve damage, cancer and birth defects".
The amazing thing is that it has been in use for over 160 years and until now, no-one has ever done a study into it's safety.
I've been under twice in my life and the second time I was as sick as a dog afterwards.
SMH Article