I have only nebulized with the capsule twice so far. My lungs tolerate it without any issue thus far. The day after the first use i coughed up more easily and thoroughly and felt much better afterwards. For me it is too early to tell if this is going to help or not. The only cautions i have read are for people with Asthma who might be sulfite sensitive and could get Bronchospasm from it. But it seems easy on my lungs. The smell is not pleasant but dissipates as you use it. I decided to try it because i feel i have inflammation which can make the mucus difficult to get up on some days. For me it is essential to get it all out.