From The Verge:
“This is a smaller study, but with concerning implications,” says Bobby Najari, a urologist at NYU Langone who was not involved in the study. Najari already counsels men who use marijuana regularly to cut back because of the effect on sperm count. “I think one of the important positive things about research like this is that it may further motivate men to change their health,” he adds. “It’s one thing to talk about sperm count, another when you’re talking about the potential health of the child.”
“I want to be very careful to not have the results turned into something that they’re not,” says [Susan] Murphy. “It’s not intended to scare people. Our whole objective is to learn more about biology and what effects there might be.”