Personally because there is no particulate or tar as there is with conventional smoking, like it depends on the weather, if it's nice I'll cruise with the "windurs" down (southern), if it's blistering hot or colder than a "witches

in a brass bra" (another southern saying), I leave the windows up.
(It doesn't scum up the windows like smoking either)!
Even when I have others in the car the worst complain I have to take is "gawd, I can't stand 'Root Beer", or "is that Coke"
Man I vape in bed, I vape at work, I vape EVERYWHERE!
There is only one ocassion when I don't vape, and I do afterwards !

