If you had clear hallucinations (OEH OR CEH) that usually means the cannabis was laced. I have smoked some great Canadian weed and I never had hallucinations that I could clearly see, although when I am high on good weed my mind wanders off and I get a great understanding of things.

Did it smell differently? How many hits did you take to get you high the first time off of the stuff? You can usually tell when dealers lace their weed as it will look differently. Was it hard? I don't know man. I may have had laced stuff before, but prob not.

If you are used to smoking weed, you will definately tell if it is laced or not just by the experience. A weed experience only activates the cannabanoid receptors and no other drug is like weed.