I have done two A/B tests with flushing. Both were blind tests, no one knew which they were smoking.The first test had one hit of non-flushed and one of flushed in random order amongst three of my friends. Of course those smoking the first hit already had a buzz when they smoked the second. The results of who prefered which?... split right down the middle. (I had someone randomize my sample for me.)
The second test was the next day. I told people I had forgotten to write down the results, but secretly I changed the order of what people smoked the night before. Everybody prefered the OTHER smoke. In other words, they stuck with their previous results even though if they'd selected flushed as best the first day, they now selected non-flushed.These were soil grown.I don't bother to flush anymore.Don't take my word for it. Try it yourself.