Smite Bug (Gameplay)

Not entirely sure if this is a bug or a technique to make only junglers use smite to speed up jungling, while not letting others make full use of buffs. When a monster has smite used on it, it gives a buff. In this example, I will use the one I found this on, the Gift of the Heavy Hands buff from the large duo creeps. When you hit a target, the 6th attack applies a small stun. To me, that seemed useful on a support, so I took smite and got the buff. When I went back to get the buff again, smite wouldn't give me the buff. I presume it's because the same person can only acquire the same buff from the same, non-respawned monster once. I have yet to try to see if this impacts multiple people smiting one target. As it stands, it simply takes away from the ability to use smite for buffs and not just for clear speed.