Mugwort is an old hearth herb.
If you dry it, rub it up into a kind of fluffy mass and then light it, it'll give off a very white, and pleasantly scented smoke. It's a traditional anti midge remedy, anti-moth in clothes, anti flea too.
It's a decent filler in herbal tobacco mixes, it's apparently fairly gentle on the throat (don't know, I've never smoked. My Mum died of cancer when I was 14, the connection is just too visceral) and as a tea it's supposed to be good for the digestive system.
It is used as the glowing ember under a piece of vermiculite to heat up and disperse resin, all the benefits without the burning kind of thing.
I grow it in the garden so that I have it to hand. It dries easily. I take off the froths of the flower clusters and dry them seperately, but the hands of leaves I just pull off from the stems, tie in bunches and hang on the washing line to dry.
Really, really good in tinder bundles