Did you have a lot of caffene in your system at the time?
I sometimes get a racing heartbeat & breathlessness from caffene (>= 2-300mg) & weed ( only when smoking a LOT )
CheeseOnToast Reviewed by CheeseOnToast on . pot made my heart race and sent me to the ER ok, so i'm a med patient in socal; i get very good med stuff, and i REALLY don't think it is laced, it is just very very potent, i have some jedi (some trainwreck cross, and a lovely daytime smoke), and some bubba kush (very very heavy, sleepy, and the only strain to bug me mentally so far: one time gave me a ton of depression/self loathing) anyway, so, one night i smoke the bubba and my heart races a bit; another time i smoke the jedi and it races a bit as well; then once i smoke (let me Rating: 5