Cannabis is related to hops, so compared to some of the weird things people have put in beer it kind of makes senses.
The Cannabia beer I was bought is a hemp beer though. I don't know much about hops that sounds suspiciously like the part of the plant they make ropes out of, not the part that gets you stoned. So probably not what my friend was curious about. And as to how it tastes...well, like a sweet lager. One for interest only I'm afraid.