Is it true that smoking weed kills human sperm?

In a way, yes. Heavy marijuana use has been linked to lower sperm count and sperm quality due THC's interference with the sperm enzyme cap, the acrosome. Essentially, this causes sperm to use up all of their available energy before ever reaching the egg for fertilization. read more

A 2003 study from the University of Buffalo found smoking marijuana can make sperm less fertile, even if the woman is the one who smokes it. When women smoke marijuana, nicotine, or other drugs, their reproductive fluids, or vaginal secretions will contain these drugs. read more

Weed contains THC or tetrahydrocannabinol, which may disrupt the way the sperm swim. In normal males, the motility of a sperm cell is considered to be good if it swims in a forward and straight direction quickly. In men who smoke weed, these sperm do not swim in a proper fashion. High levels of THC stimulate key receptors in human sperm. read more