The result came as a surprise to Harvard University scientists measuring the sperm counts of more than 600 men from couples attending a fertility clinic.
They reckoned that there could be a "non-casual explanation" to the effect of male testosterone on "sperm count and risk-taking behaviours".
Chavarro warned that the findings don't necessarily mean that smoking pot increases the chances of making a baby. It could be that males with higher circulating testosterone concentrations are also more likely to smoke pot and engage in other "risk-taking behaviours", he and his co-authors postulate.
Lead researcher Dr Jorge Chavarro, from the Harvard TH Chan School of Public Health in Boston, said: "These unexpected findings highlight how little we know about the reproductive health effects of marijuana, and in fact of the health effects of marijuana in general.
Secondly, the study is a great opportunity to spark interest on investigating the health effects of marijuana particularly with the backdrop of increasing legalization of recreational use in the US coupled with a greater perception that marijuana poses no health risks". While he's not certain of the drug's impact on male fertility, he believes it's more likely that men with higher testosterone levels will be more inclined to use marijuana.
Researchers collected 1,143 samples from 662 men between 2000 and 2017.
On average, the men were 36 years old, mostly white and college educated.
The participants in the new study self-reported their marijuana use, so the details they gave may not have been accurate.
Of all those who participated, 55 percent had smoked marijuana before - 44 percent of those men had tried it in the past, while 11 percent were current marijuana smokers. For example, in 2015, researchers from Denmark found that men who smoked marijuana a few times per week had sperm counts that were almost 30 percent lower than those who didn't smoke marijuana, or those who used the drug less frequently.
Analysis of the sperm count indicated those who reported to have smoked marijuana had a sperm count of 62.7 million sperms per millilitre as compared to those who had never smoked with an average of 45.4 million/ml.
A new study suggests men who have smoked cannabis in the past may have a higher sperm count than men who haven't used the drug.
Among men who had ever smoked marijuana, those who used it more often had higher testosterone levels than those who used it less often.
Scientists analysed the sperm quality of regular cannabis smokers as well as non-smokers, with some unexpected results.
The endocannabinoid chemical messenger system in the brain, which is targeted by the drug, is known to play a role regulating fertility.
Other experts in the field have questioned how robust the association is.
This view was echoed by leading British expert Allan Pacey, Professor of Andrology at the University of Sheffield. Sperm motility decreased, acrosome reactions failed to occur and worst of all, sperm counts dropped" and the function of the Sertoli or "support' cells that create key proteins to sperm production declinees, she explained.
'I would urge caution in accepting the findings of this study, without further information'.