It smells like flowers in a funeral home. Could it be lavender?
That is what I thought too: also called sweet rocket or dames rocket.
Don't know what state you live in, but for what it is worth, dame's rocket is listed as a noxious weed in at least three states and is under consideration for listing in several others.
It's not phlox--phlox has 5 petals. I agree with those who said it was Hesperis matrionalis. It's invasive in some areas.
Wild Purple Phlox is rather uncommon to rare anyway.
Checked into it when I got home and it matches the one I have and it is definately hesperis matronalis or common name dames rocket. Mine is purple with fuzzy leaves and about 4 feet tall.