You hit a vessel. Plain and simple. You pretty much main lined it like a junkie would heroin. The coughing is caused by the vessels in your lungs disagreeing with what you just did

Possibly it was from so many cc's that your body was trying to reject the oil. 1st time using 3 separate compounds or 1st time with any of the compounds? Could also be one of the compounds you are using in that cocktail.

I had the same issue for about, 10 weeks into my current cycle, was first accusing the Tren. But then the cough continued for almost 5 straight injections after, without tren, just sust 350 and eq 400. sometimes wasnt so bad, some times had 911 dialed on the phone ready to hit send. When i ran out of this gear and went to my usual stuff, the cough instantly disappeared, (sust 270/eq200). shooting EOD did not have any issues for weeks, got in some test 400, shot that with sust and eq, cough came back. Then i realized that the ONLY time i had a cough after an injection, was when there was Ethyl Oleate used in my gear..it is not coincidence iv experimented PLENTY. aspirate everytime and pin is still, i cant imagine im hitting a vein ONLY when taking Gear made withE.O... point is, i think it gives me a reaction, allergic, not sure, but that was the culprit for myself, just giving you something to look into as a cause because for me, and friends, that cough is enough to make u skip shots or even stop all together...

probably hit a vein