Smelly candles/room sprays/diffusers usually give me headaches and make me want to puke. (I have loads of them though, because having a vagina seems to mean you get given smelly things as gifts all the time.) I hate the smell of flowers and will put them outside if they’re stinking. I’ll sometimes spray my favourite perfumes on fabric things (beds, sofas, curtains), but I’m a great believer in open windows. It’s got to be horizontal curtains before I’ll close a window.