Yes they do, that's why it is better to cut the whole plant at the bottom and hang upside down to let your buds dry out on the stem, the longer the better I have even let plants dry out still in the pot when the plant is finished just stop watering it and put it in a dark place for about a week or two until the plant is completely dried out and then harvest it, this method has produced some of the most terpene rich weed that I've ever experienced.