Asthma, though it is a respiratory condition much people suffer from and seem to be easily eased with the absorption of an inhaler is much more complicated than that. Having asthma means that the level of oxygen in your blood when you are able to breathe normally is very high. You cannot significantly increase the level of oxygen in your blood by using an alcohol inhaler!
If you have a little gag - and want to overcome it - then just work on breathing harder and deeper. Our lungs, as you may know, need to have the right mix and level of oxygen and carbon dioxide (CO2). If it gets too out of balance it will mess up our system chemistry and we could be in danger of dying. Realize that we need to keep enough carbon dioxide in our lungs - not just oxygen. We need the right combination.
So, if you suffer from asthma, which means that you have the ability to do this cool bronco constriction thing - and you want to create an asthma attack - just breathe in such a way as to lower the carbon dioxide in your lungs. Just like that. If you already have an asthma attack and want to make it worse - can you think what you need to do? But, as well as you are concerned about the side effects of asthma inhalers, you may also be concerned on hoe to handle this.
The answer is obviously not to do anything but take your asthma remedies and stay alive so you can learn how to use homemade asthma remedies (it is always good for any asthma situation, which usually take place at the worst moments). Once you learn how to do the breathing to stop an attack using less and less medication - you will find the attacks happen less often and you can relieve them without your ultrasonic inhalers.