Hum.....unless you have a PR, super fast lighter reflexes, and are in a place where it's ok to light up...all you really can do with your service is acknowledge the time.
I want to see that office exec excuse himself/herself from the corporate meeting, sprint up the stairs to the roof and light up every day at precisely 4:20. Or, the short order cook step out the back door and leave a pile of unfinished orders, and food burning on the grill.
But I suppose if someone can always be in the right place, at the right time, with the right accessories, you're service could be beneficial.
Wasn't that a movie....."NICE DREAMS"?????
If it harms no one, do what ye will