I would have to say occasionally, myself. I share the OPs constraints on time and location. Although I own my home, I don't smoke in the house, nor do I smoke in the car. Lose too much in value! Do you know, it is now California State Law that you have to disclose if you have smoked in the house in the last three years to potential new buyers... CRAZY! Well, that's just one of many reasons to run screaming from this crazy State to a slightly less crazy State of Colorado!
Anyway, I don't like doing quick smokes... if I am going to smoke, I want to spend a good amount of time doing it slowly and enjoying it! I like to make sure I have at least 45-60 min to enjoy my smoke.