flushing ..... ur havin a laugh. is tobacco flushed ? no. are tomatos flushed ? no. are herbs flushed ? no.
what is expected to be believed is that cannabis is a unique plant, evolutionary different to all other plants in that it stores chemicals in its flowers. chemicals that travel up the xylem (?) and phloem (?) - biology was so long ago! and then nestle in the buds to be broken down there and then converted into smallers foods. pish!
flushing is the biggest scam going, dont buy into it!
Flushing or lowering the nutes at the end to a mild concentration isn't for the purpose of removing chemicals, but rather shifting the elements that already exist in the plant. The idea is to starve the buds of nutrient so they will sap nitrogen out of the surrounding leaves. It's a matter of reducing the overall amount of chlorophyll in the plant's body when harvest time comes... reducing or eliminating that 'grassy' smell and taste we all hate so much... So I agree, it's not about 'the magical removal of chemicals.'
And marijuana is different from a tomato considering the way it's consumed. Do we smoke tomatos? No. We smoke the flowering tips of marijuana, though. And when smoked, the presence of chlorophyll from a bud that was allowed to feed too long will taste like shit. It's the combustion process of the chlorophyll that is nasty tasting. No flush will give a surplus of nitrogen in addition to the nitrogen stored in the plant -- which will convert to more green chlorophyll at the end.
edit:
And with tobacco, the leaves are smoked, not the reproductive flowers, so a different situation again.
I realize that the flush / no flush argument will probably keep raging forever. But the truth of the matter is reducing your nutrient concentration to a very light touch towards the end will certainly not hurt your plants. And letting them continue to feed to the end certainly won't hurt your plants, either. But I've done both in hydro. And the lightly flushed bud just tastes better.
edit:
And a scam is a deception put forth by a person or entity for some sort of benefit to that person or entity. If flushing is a scam, who put if forth and how does it benefit them?
Cannabis shares characteristics with other types of plants, but it is unique, as all other types of species and subspecies are unique. What's more, the method of cannabis consumption is unique.