this happened to me yesterday

contrary to popular belief of "laced weed" , the thing is, there is nothing wrong with the weed.

Chances are you had TOO MUCH, and the high you experienced was so intense and harsh on ya that it felt like you was dying.. but trust me, death will never happen off marijuana... ur just high as fuck

You can prevent "bad highs" by smoking patiently, not all at once, and maybe by not smoking on an empty stomach. Eat something a little.. you'll still get as fucked up and it wont feel like shit.