I too have been addicted to nasal spray for years. I didn't use it during my first trimester but also didn't get any sleep due to a blocked nose - this caused me to go mental. So, I am now using it again. If you google the active ingredient, there has been a proper study done recently on pregnant women - it found that the active ingredient does not "cross the placenta" unless severely overused.

They approached a bunch of pregnant women and asked them about it and a surprising number confessed to an addiction - they tested those using the recommended dose (I think it is 2 sprays per day) and found no evidence it had crossed the placenta. The then found women using massive amounts (15 sprays in 4 hours) and found that minute amounts were crossing the placenta - it is easier than you would think to overuse this stuff it is severly addictive and this second trimester drippiness doesn't help.

The effect of this massive overuse was some slight evidence of feotal cells "shrinking" for a period of thirty minutes. They tested teh babies extensively for any evidence of permanent cell damage and found none at all.

Every doctor and chemist I have ever spoken too says that the long term consequences for addicts is damage to the membrane in your nose which exasserbates the problem - there is no evidence of cancer or any other severe side effect.

On a less medical level, my friend jsut lost a friend to throat cancer - the woman had never smoked and had lived a fit and healthy life away from big city pollution - the cancer grew rapidly and couldn't be operated on. She had a nasal spray addiction.