I have a Smok Stick V9. It came with a V2 S1 coil and a V2 S2 coil. I went to local vape shop to buy replacement coils. The owner sold me a V2 S3 coil said it would work. Not really liking it. Will the V2 S3 coil work or did I waste my money? Please help!

Never heard of the V2 S3 but your device should be pushing around 60w. Check the range on the side of the coil, if 60w is in between them you should be fine.