Personally I think public buildings should not allow smoking by default but businesses should have the ability to construct 'smoking lounges' in which smokers may go smoke inside. I've seen these in major international airports: https://en.wikipedia.org/wiki/Smoking_room#/media/File:Camelsmokinglounge.jpg

Flipside, have you followed the tobacco = cancer research lately?

You will find all the anti-tobacco research ended in ~2005.

Tobacco consumption has continuously decreased but you will be hard pressed to find tobacco = cancer research since 2005.

In fact, if you look for updated information... there's a dramatic increase in lung cancer since about 2005.

So what happened in 2005? Science-wide you had to start declaring your conflict of interests. But that doesnt explain the increase in lung cancer. Its not better detection. We had the same capability of detection in 2004. It is a genuine increase and is becoming worse. More problematic, the raw data says tobacco is not related or at best poorly correlated.

The problem? Go look for lung cancer vs tobacco statistics. It's heavily censored and literally nobody is looking into it. They are happy to just keep blaming tobacco?

Not saying go buy a pack and start smoking again. We know tobacco isn't good for you.