Welcome to HCM
We understand your concerns
You are right in your thoughts. Machine uses some chemicals and nitrogen for making quick ice and these chemicals are harmful to the body if taken in excess. Our body tolerates everything that is mild. Cold
water and ho0t water or cold or hot items are tolerated upto an extent. Then body reacts. Your throat symptoms are made out of your machine ice habbit. Remember singers who use warm water to keep their throat perfect. Throat is an area where sensitive mucuous area is present. Treat it well.
Good luck. Get well soon.