Clinical embryologist Dr. John-Brown Mensah states tobacco and cannabis consumption directly reduces male sperm counts and increases miscarriage rates.
His declaration coincides with declining global fertility rates and rising cannabis use among young adults.
During an interview on the Ride and Chat show, Dr. Mensah attributed these reproductive health impacts to marijuana’s biological effects.
He also described growing commercialization in reproduction, including men selling sperm for income and women pursuing surrogacy for financial reasons. Dr. Mensah referenced potential laboratory development of infants with specialized traits.
These clinical observations emerge amid expanding cannabis legalization and economic pressures influencing reproductive choices worldwide.

