IIRC GW50 is also highly carcinogenic.
The Xenon ban is a joke. When they announced it they wrote that it had not been demonstrated as "safe or effective," a slick way of admitting that there's no evidence that it's a PED but retreating to the original 60's anti-doping mission of health and safety. They go on to declare that inhaling gases such as Xenon, carbon monoxide and hydrogen sulfide is dangerous, apparently on the grounds that two out of three ain't bad. In fact, Xenon is an inert noble gas and there's no evidence that it harms anyone. No athlete is huffing CO or H2S, WADA just hopes people are gullible enough to associate Xenon with those toxic gases.
This was several months ago. Nobody else seemed to notice WADA's absurd reasoning but me, and when I pointed it out, legions of lurkers pointed out that "Xenon is doping" etc etc. Now that the ban on oxilofrine is suspect, maybe more people will wake up to the way WADA works. They are not there to prevent cheating or ill health, just to create the appearance of doing so. When something new comes along, they will ban it if they can because it makes them look busy and makes their client sports look cleaner. Never mind what it is or if it even works; their statement about Xenon shows they don't even have people competent to evaluate that. And they deliberately remain just incompetent enough to stay behind the curve when it comes to real, proven performance enhancers, so that their client sports remain popular as well as "clean."
With Xenon, they also left themselves with no principles, i.e. a leg to stand on, when it comes to the ethics of blood boosting. Suppose Xenon does work - inhaling a mixture of gases modified to non-atmospheric levels boosts epo production and HCT. How is that different from an altitude tent, other than that the gases used are different and much more expensive? WADA offers no ethical distinction, only the hypocritical assertion that they are against using gases for blood manipulation even though they have already approved it for years. Maybe altitude tents are ok because you could do the same thing naturally? Actually, no you couldn't - in the real world, "live high, train low" requires more travel than simply entering or exiting a tent. Besides which, you can breathe concentrated xenon in mineral springs, making it as natural as altitude training. No, WADA is full of shit.