5 for gross. I know that's calling the kettle black a bit, but at least I'm courteous about my smoking. I was on an airplane one time and the guy sitting next to me was already drunk, which is fine (I need a couple of drinks to fly myself) but he spent the entire time chewing tobacco and spitting it into those little transparent cups. Like, yeah I was looking for the smoking lounge after that 8 hour flight, but I was mostly looking for the bathroom so I could puke.