They've been trying to ban the use of certain types of propellants for many years now. About 20 years ago, my pharmacist gave me my regular prescription inhaler that had been recently changed to be manufactured without propellants.

He instructed me that I had to "inhale forcibly" to get the medicine into my lungs, now that it no longer came with propellants. In other words, without the propellants in the canister, the person whose lungs can't take in any air, (during an attack), must somehow find the breath to force the medicine into the lungs, rather than rely on the propellant to get it into their lungs for them. Fancy that. And - at the time, since they were still making my inhaler WITH the propellants, I was able to raise enough of a racket to get them to make the original ones available to me.

When that stopped, I turned to Primatene.