If your blood pressure is highly "sodium sensitive" it is possible to see a rise - but it didn't seem to make any difference for me.

I did the calculations a while ago, and for each 7% neb you will inhale 280 milligrams of sodium, a portion of which will cross the cell barriers into your blood stream. The remainder will be coughed out or remain in the mucus in your lungs.

So, if you assume 1/2 the sodium gets to your blood, that is 140mg, or less than the amount in a slice of bread or one ounce of cheese. Even using 7% saline twice a day, the added sodium is less than the 2000 mg RDA, and should be able to be compensated for by adjusting your diet.
For example, replace one 4 oz beef patty (400 mg) with 4 oz of chicken (100 mg).

Sue