Bad advice! Many power companies (the one I work for included) will prosecute you for vandalizing their property. The pole does not belong to you, so you have no right to start "smacking" it with a hammer. Hitting a suspect pole may also cause a power outage if something is ready to break. There is also a distinct danger of a cracked transformer switch, failing lightning arrestor, etc shattering with pieces falling on you or nearby vehicles.
Don't do it, please!
Well, I don't think that a little tap will hurt anything. I've used a hand sledge to stop arcing many times in the past, but I didn't hit it hard. If you tap on the right pole, it just takes a light tap to affect the noise on the portable radio in your other hand.
You can probably do more damage by yanking on a pole guy too hard. I've seen cows scratch themselves on pole guys, and the transformers and wires really danced! No harm was done, but I sure wouldn't try and duplicate what a big cow can do.
Who said anything about a little tap? The poster said to "give is a health smack" (sic). Tap or smack, you have no right to hit utility company's property. No more right than I have to smack your dog with a hammer if it barks too much. Or crack the neighbor kid's rice box with a loud muffler.
I have been doing interference investigations for the electric company I work for over 34 years. The safest thing to do once you locate a suspect pole is report it. Yes, I know some companies suck at responding to these calls, but I make sure I thank my customers for calling us, even if it's the noisy power supply in their computer. I have found many problems ready to take 1000s of people out of power thanks to a report from a nearby ham. One line fed a small hospital. Imagine the outcome if someone would have nailed that pole with a hammer.