I bet David did mean that he's had to confiscate the matches from students; I don't know why that never crossed my mind. My husband is a professor at a local University and their campus is now tobacco free. Many of the students and some faculty members don't like the idea because they can't even smoke in their vehicles in the parking lots ... but campus sure is a lot cleaner now without the litter of cigarette butts.
I've never heard of anyone using match sticks as a phosphorus source for their plants and I'd have no idea how many should be used per plant but it may be a good method of recycling those matches.
