Smoking on buses is illegal
Yet you see the drivers standing inside the open doors doing it when it's raining
I saw a black taxi driver smoking behind the wheel last week in central London
the point is, some things are more annoying than others, I'm not for vaping in offices, workplace etc when there are area's (outside) available that inconvenience only the vaper, much as it does smokers.
Just because it's not harmful, doesnt mean we should all have to deal with it