I would vote against it if the suggestion was to do chemistry one semester and prepare food the next, year after year, even it you did a thorough cleaning in between. I might vote in favor if it is a renovated lab space that has been "permanently" reassigned after proper decontamination and testing. I think part of the problem would be student and even public reaction to the ick factor. On the other hand, if you are talking about a food chemistry class and nobody is eating the food, I see no problem at all.