This is something that can be curbed with practice. If you give your presentation to someone, they should point this out. To get better at public speaking, you should try to curb any behavior that detracts from the message that you want to deliver.

I remember listening to RMS talk at the HOPE conference one year and it was painful to watch him talk. He obviously needed very long breaks when he was speaking, using them to take sips of Pepsi. The pauses were at times in his speaking were almost planned for some sort of applause or at best internal agreement and reflection on the idea. It was all very awkward, if you can't tell.

It was RMS, so nobody cared, but I'm sure that he could have gotten his message across better with some effort.