Marijuana smokers appear to have impaired fertility potential.
Smoking men have reduced semen volume and total sperm number. Seminal sperm from MJ men express abnormally high hyperactivated mobility which persists after a wash and swim-up. These sperm may burn out quickly and reduce fertility.
We note that women smoking marijuana will have elevated THC throughout their reproductive tract, thus affecting sperm in the cervix, uterus and oviduct.2003