Xylometazoline
"Became addicted to it.  Used it several times a day for about 20 years. HAD to use it to keep nostrils open.  Finally a doctor said I should stop.  I quit cold turkey.  Very hard.  After about a month it was OVER.  I do not need them now and do not have to carry nose drops 24-7.
Do NOT start using it!!!  Have been off them for over 15 years now."