@roger,
Oh no, it's great.
Especially in the winter when your nasal passages get dried out. You can really breath afterwards.
I was hesitant about trying it. I wonder who the first person was who thought "Hey! I'm gonna put salt water up my nose and flood all my nasal passages, so that 3 or 4 hours from now when I lean over to pick something up off the floor, a gush of water pours out!"
Amaze your friends!
Seriously, it's like 1/4 of 1% as bad as you think it is.