In 2015 author and right-to-die advocate Derek Humphry reported that Worthington Industries, the world's largest manufacturer of disposable helium cylinders, had announced that their helium cylinders will guarantee only 80% helium, with up to 20% air, making them inappropriate for use with a suicide bag [REF].
Dutch psychiatrist Boudewijn Chabot, in his 2015 book Dignified Dying, calls the suicide bag with inert gas method "rapid, painless and safe" [REF].