I believe some of the fox farm nutrients are organic I'm pretty sure the bloom is, but yeah I agree people put all sorts of things in there plants and it's like dude your going to be smoking that at some point, I've heard of bush load giving cancer due to the chemicals in it, but honestly that's why I don't even like smoking other people's because you don't know what kind of bs they put into it, I normally give my plants water the last week or at least couple days where I can can water it twice and enough time to let it dry before I cut it down.
But think of it like this, how in the world are you going to flush chemicals out that you have been giving for months, you just can't it's impossible and alot of chemicals don't even flush out of the plant, same for mold once the plant has it, you will never get rid of it, you can treat it but never truly kill it.