If you’re a testicle-having person who smokes weed, you’ve probably heard that you’re harming your reproductive health. You’ve probably heard that smoking weed lowers your sperm count or reduces the quality or DNA integrity of your sperm. If you’re not trying to have a kid, maybe that sounds just fine. But a new study by Harvard medical researchers, published today in the journal Human Reproduction, is challenging this oft-repeated conventional wisdom. According to researchers, smoking weed may actually make a person’s testicles more fertile, not less.