I am on the fence, however I have not flushed in a year and a half. I grow in pro mix 4, so it is basically an inert grow medium as well.
I would be the first to start flushing again as soon as ANYONE can provide scientific links that show plant matter tested with nutes delivered to the end of harvest showed residual chemicals, nutes etc.
I have heard a lot of "in my opinion" or "tastes fine to me" or "I see no difference", but all I want to see is scientific proof, that mj plants retain chemicals in their buds and that toxins are present. I am not saying that they don't, I would like to see tests performed in both instances, not a bunch of hyperbole, and speculation mixed with a few botany facts.
The fact that this discussion remains a highly disputed one, suggests that there is no evidence either way, or if there is, than why isn't flushing an assumed practice that everyone does?
Show me the chemical analysis of buds grown using both practices and I will determine which I choose to smoke.
Right now, I am happy and so are my clients.
Oh yeh, I live in Colorado where top shelf weed is cheap and easy to find. My client list is the same as it always has been for the past couple years, even after I stopped flushing.