I live less then a two minute drive from my job so I usually go home. I can light up a cigarette in my drive way and still have it when I pull into the parking lot.
There's a lot of fast food places and pizza/sub shops around here so it's not hard to grab something decent and come home for an hour.
There's no way I can stay at work. After being locked up in the process area's and labs, I work in a Pharmaceutical plant, I need to get the Hell out of there.