In essence, a cone is an empty joint ready for filling, and a joint is already filled and ready to smoke. Paper cones for weed are designed to make rolling joints easier. A joint is rolling paper or a pre-rolled cone filled with weed that’s ready to smoke upon purchase. A pre-rolled cone is rolling paper that’s been formed into a cone shape with a tip or filter already in place. Customers buy these to easily fill with their own weed, twist the top closed, and spark up.