yeah, I get it in the quads more than anywhere else. Any compound casues it, and I will argee with tony to an extent that the casue is a quick entery into the bloodstream. Hownever, I beleive its the compound and not the oil. I can only specelate why as I have not found anything significant to explain this. But it seems tren is notorious for this, so I would think its related to the particular compound entering the capiliaries around the aveoli in the lungs, producing a irritation/constriction that yeilsd in the cough. Seems as though the compound determines the severaity of the cough as I have had the urge on test but I have prayed to the porcelin gods on tren. However, Anyone ever use Test. Ace? Maybe, just maybe its the ester? I haven't heard to much about Tren E or Tren hex producing the phenomia like coughs the ace ester is famous for. You guys jsut gave me an idea for a little experiment, lol.