Is that the reason he was laughing?

A new person started working at the company I'm at. Whenever I'd see him around the office I would smile and say hi. He would say hi back but he would always laugh a little bit. I was thinking maybe he thought I was odd for some reason as I hadn't really spoken or worked with him yet. The other day though I actually had a conversation with him as I had to ask him a question. The first thing he said when we started talking was that I had a really nice smile and it was comforting. Was that probably the reason he kept laughing when he saw me earlier? Was just curios about it.

Is that the reason he was laughing?
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