Were the joints/blunts laced with another drug?

No probably not. Chances are the atmosphere and the weed affected you. You also don't know what kind of weed it was. Everyone thinks they have a higher tolerance than others, let me just say as a person that has a ridiculous tolerance for everything myself and smoke many different types of weed, there are some strands that will knock your socks off. Plus weed and affect you differently in a concert than when your just sitting around at home. Sounds like you may have deprived your lungs of oxygen, you were dehydrated, or you had a mild panic attack which happens on weed. I've laced weed with every drug imaginable and unless the same thing happened to the people you smoked those blunts and joints with I don't think it was laced.