Smoking and panic disorders

tryin to recover from 2 weeks ago but i been takin vocoin for few months just to feel good but it might have something to do with my problem i had a bad panic attack on july19 saturday i took a few hits off a joint and freaked out really bad that day but when i went t work the next day i was a delivery driver so i took so food to the hospital and felt strange that day so when i dropped it off i got back into my car and came up on a red light and thats when i got hit with a bad panic attack heart racin so fast sweatin and hot flashes i thought i was going to die until i called 911 and went to the same hospital that i just came from they took my blood and ask i i was on medication at home i said no and they told me you had an anxiety attack but did it have something to do with that day i smoked or are they two differnt things because i still go threw the symtoms ever sence those days so did i get anxiety from that day i smoked and now its with me are these connected some how can heat bring an anxiety or panic attack? i just need an anwser please help me out i just want to feel normal again i hate the fact i can't get back into my car again without thinkin of an panic attack!