I have been an avid iv meth user for about a year n a half.....and I have asked this question to those that are of the same....what in the hell causes the meth cough when u get good quality and slam it? It makes the best high. Ur feet are on fire, instant orgasm n all that with the damn cough. Ive heard its from where ur heart swells up and stops ur lungs from passing air....idk. Does anyone know what really causes that?? Thanks!