What kind of tobacco doesn't smell?

I was eating at a cafe and seated to a table where it faced the street, and when I finished, I went to go shopping. When I exited the restaurant, there was an alleyway and three people sitting down smoking!

I felt weird at the restaurant but I couldn't put my finger on it, and I also didn't detect the smell! To be fair, there were a lot of strong smells, people wearing perfumes and shit, throughout the day and my nose and brain was already exhausted.

I felt like I should have been able to notice three people smoking. The other people in the restaurant didn't seem to notice either.