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Kush can make some people very sleepy or feel like they can't stay awake.
Very potent strain especially for inexperienced types.
Kush is one of the most well known/popular Indica strains.
Indica = body buzz / sleepy
Sativa = mind buzz / energetic
I mean that is an overly simplistic explanation but it'll do.
Save the pre-rolled joint for later.
Buy a small metal pipe and a lighter for a few dollars plus a pack of pipe screens for $1-2 and smoke very small amounts of it and see how you feel.
Won't take much at all to give you a powerful buzz, especially since this is potent stuff, not like the more basic/less potent stuff that used to be the norm.
Not everyone reacts well to this stuff and even if you enjoy it you should consider that making it a habit can be harmful and that the harm can build up over time (boiling pot effect) making it difficult to notice.
Not saying its a problem if you're gonna just enjoy what he gave you and stop but if you decide to keep going and really make it a frequent habit then keep what I said in mind.