This is a Doutor Coffee shop. One difference from home is that coffee shops don't open until 7am in Tokyo. Another difference is that smoking is just fine in some coffee shops in Tokyo, smokers doesn't seem to carry the social stigma that they do in the US. You can light up nearly anywhere here without getting nasty looks or being considered a pariah. I sat down with my small cup of coffee ($2.20 US) and smelled cigarettes. The salaryman next to me was puffing away. And so was everybody else. The only person in the place who seemed to give this activity more than a passing thought was me.
One woman who appeared to be in her early twenties walked in wearing a surgical mask. Many people here do so that wasn't all that unusual. She ordered her drink, sat down, pulled the mask down exposing her mouth and instead of sipping her drink she lit up and began to puff away. So I guess that not everybody here who wears a surgical mask in public does it for health concerns, maybe it's just a fashion statement.