Is there a specific study on this? I found one that states the opposite: Thistle JE, Graubard BI, Braunlin M, Vesper H, Trabert B, Cook MB, McGlynn KA. Marijuana use and serum testosterone concentrations among U.S. males. Andrology. 2017 Jul;5(4):732-738. doi: 10.1111/andr.12358. Epub 2017 Apr 10. PMID: 28395129; PMCID: PMC5660879.
“A 2018 study in Andrology looked at healthy guys without clinically low T who had consumed marijuana at some point in the last five years. Researchers found that healthy guys who had smoked within the last 30 days had higher serum testosterone levels compared with those who hadn’t imbibed in a while. Another study, published in the World Journal of Urology in 2020 found similar results—that marijuana use was associated with small increases in testosterone.” From men’s health magazine