I stopped using synths a while back because the side-effects just became too worrying. I had been smoking 5F-AKB-48 and, when I couldn't get that, I went for THJ-2201 (absolutely awful). It seems that these fluorinated synthetic cannabinoids are rather harmful. I had noticed the pains with 5F-AKB-48 but it was when I went for THJ-2201 that I really noticed it. I put up with the pains until they reached my gonads. From what I read, these pains seem to be caused by a build up of sodium fluoroacetate - a rather nasty compound. The metabolic half-life that is touted for this seems to be about right as the pains had mostly disappeared after a few days of discontinuation. I noticed far more pains and other worrying side-effects with the THJ-2201, which may be something to do with the naphthalene ring or whatever the correct terminology is.
Is there anyone who is still smoking the fluorinated noids, or has in the past, and experienced these kinds of pains? If not, it may be down to my individual biology and I'm reading too much into the pains. I just wanted to give a little heads up because I'm now paranoid about some nasty health problems in a much less distant future than I anticipated.