It all depends. You have to watch out for the new FAs. One came up to the flight deck and was shocked to see "all that smoke." It was a humid hot day, and we explained what it was. She said no way, I've never seen that! She learned something.
Another time, departing a hot/humid day, just airborne, a new FA reported smoke. Alarmed, we gathered for more info, while getting ready to declare emerg/QRH/land. When asked for the source, if she could see it, she said was the gaspers at the top and the floor (lining) bottom where the air comes out from the air conditioning system. We asked for the color of it, she said it was clear/white. Any smell? No. We asked she go and touch a few gaspers and see what she feels. She reported all of them had small water droplets, like mildew.
We concluded it was condensation fog, continued flight, uneventful.
Sometimes, you have to watch out for newbies. I would have hated to do an emergency landing for a condensation "smoke."