When I was young, in the eighties, one fellow in our scuba club did suffer of asthma. The symptoms were exacerbated by the fact that you breath very dry air.
His solution was simple: an humidifier installed between 1st stage and IP hose. It was a small cylinder containing a tubular sponge, which had to be saturated with water. This was very effective creating some sort of mist in the air you breath.
I suppose that those humidifiers are stll being manufacturer.
I also suppose that replacing water with some mild, diluted aerosol solution can provide even better effects...
See here:
http://shop.divingexpress.com/index.php?route=product/product&product_id=2181
His solution was simple: an humidifier installed between 1st stage and IP hose. It was a small cylinder containing a tubular sponge, which had to be saturated with water. This was very effective creating some sort of mist in the air you breath.
I suppose that those humidifiers are stll being manufacturer.
I also suppose that replacing water with some mild, diluted aerosol solution can provide even better effects...
See here:
http://shop.divingexpress.com/index.php?route=product/product&product_id=2181