Nebulised Saline

Has anyone ever had side effects from taking nebulised saline? I have bronchiectasis and NTM. I do daily airway clearance sometimes I clear a lot of mucus other days I do not. No two days are the same. My consultant has mentioned that he might start me doing this but is concerned that I might have a broncho spasm. I do not want to make things worse. I am able to work and do not want to give that up. When I was off for 6 months last year it was not good for my mental health - work keeps me focused and gives me a sense of purpose