Sometimes when I take my gas it'll make me feel like i inhaled some dust or something and it'll make me cough for about 30 sec or so. I read on another post that that's what happens when you "mainline" into a vein. I highly doubt I went into a vein cause i think that i woulda had the light headed feeling or even passed out but had nothing. The coughing only happens like 1 outa 4 shots. any ideas?