A few years ago I heard an episode of "you bet your garden" where the host got a question about the best lights and setup for growing tomatoes indoors. The host kept asking the guy why he would ever do such a thing as the tomatoes would cost much more than you would pay at the store for them and the caller didn't really have a good answer. The funny thing is, tomatoes require basically the same care and conditions as marijuana and I heavily suspect that was the true motivation of that question.