There's no way to tell if you smoked "laced" weed or not as we did not smoke it ourselves, and how no means of testing the it.
I can tell you from experience though that if it were indeed laced, there are signs, such as odd odors coming from the plant (that are not the sweet sweet smell of cannabis), odd tastes after smoking the plant, and sometimes there's even specs of who-knows-what in there.
Chances are you were just "trippin' out" as laced weed is pretty hard to come by, and as I said, if it were laced you'd probably know.
Why would a dealer sprinkle/dip/etc a more expensive product over cannabis? Why wouldnt he/she just sell the product by itself? From a dealers perspective, its not as cost efficient.
Sounds like a fun time to me though, I love "trippy" weed.