Yeah harvest snd smoke what you can. I use biobizz and only flushed once for my first grow. Tasted smooth. If you didn't add anything but water for the entire grow they would've been far healthier.
The good thing about fucking up is that you learn a lot from it! So its not a waste at all, learning how to dial in your plants and reading them is key!
I cut em down and dried them out, ended up with a half oz total. Guess it wasn't too bad after all. At least I got something out of it even though it wasn't much.