It sounds like you have fungus gnats. They are super annoying but they can be eliminated. Look for mosquito dunks, put a bit in your watering can, and water it with that water. It kills the larva and then you eventually have no more adults either. It lasts for a while, so you don't have to toss out the dunk for a few months, I think; just add more water to it. You can also sprinkle those mosquito bits (I think that's what they're called) on the soil, but I haven't really been able to find those in the store, only online.

You can also get rid of them by keeping the top inch or so of the soil dry, but that only works if you have a plant that doesn't mind drying out a bit. If it prefers to stay moist, this would do more harm than good.

If you're trapping some with the vinegar solution, you might also have fruit flies. Fungus gnats are not likely to be attracted to the vinegar.

Thanks, will look for the dunks. Since moving the offending plant outside a couple of days ago, the last 24 hours have been gnat-free. I've never known such peace.

Ive had them lately too and noticed them after I bought miracle grow potting soil from Lowe's. I'm wondering if they came from the soil because the bags have holes and are stored outside.

You usually have to work pretty hard at keeping a fast draining, well-aerated soil wet enough for your container's gnat populace to be happy and prolific; and when using the heavy soils they prefer, you can easily afford to allow the soil in the top 1/2-3/4 of the pot to become quite dry between waterings - your plant's roots will thank you too. Since the gnats prefer a wet soil environment, a lighter hand on the watering can is often all that's needed to keep them under control.

Al