gettin sick after smoking for a few days???

hello everyone..thsi is my firts posto n here but ive been lookin around on here for quitesometime....lemme first off introducem y self....well actually all you need to know is that ive been smokin since i was goin into 7th grade..and im a senior in high school right now so ive put my tiem in.......but anyways...i was wonderign if any of you guys can please help me know wtf is goin on.... i took a homie home from work and in return he gave me a couple grams of some stress....so i smoekd it...eww but w.e i got a head change..then i picked up some kush..and so i was smoking constantly for about a week...well anwyays i took 1 day off and i qucikly acquired a cold.....its happeend to me b4...is it from the weed? is it laced? or did ther marijuana just temporairly fuck with my immune system? thanx!