The participants were given questionnaires to fill in which 55% of the men reported to have ever smoked Indian hemp, 44% said they had smoked it in the recent past and 11% reported to have been current smokers.
Comparing these results to their semen samples, the researchers found that men who had smoked marijuana had average sperm concentrations of 62.7 million sperm per millilitre.
"The relations we see between cannabis smoking, sperm counts and testosterone levels are because men with higher testosterone, within normal levels, have higher sperm counts and are more likely to smoke cannabis", she said.
Nevertheless, the study authors quickly noted that smoking cannabis may not mean that one's chances of becoming a father increases.
Jorge Chavarro, study author and associate professor of nutrition and epidemiology at Harvard Chan School, commented: "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". The men who had smoked marijuana also had lower levels of follicle-stimulating hormone, which has been associated with a greater risk of infertility, according to the National Institutes of Health (NIH).
The men were, on average, 36 years old, mostly white and mostly university-educated.
In short, Allan Pacey meant high testosterone = risk-taking behaviours, like smoking weed.
Writing in the journal Human Reproduction, the scientists said it was possible that low level exposure to cannabis might benefit sperm production in some way.
"Our findings were contrary to what we hypothesized at the start of the study", study lead author Feiby Nassan, a postdoctoral research fellow at the Harvard T.H. Chan School of Public Health, said in the statement.
The participants in the new study self-reported their marijuana use, so the details they gave may not have been accurate.
Other experts in the field have questioned how robust the association is. But many of these studies have only involved animals or focused on a small group of people (including the one last December).
Experts believe there may be a link between moderate cannabis use and how that can benefit the male's reproductive system. However, they were shocked to find that those who smoked the drug - even if it was only once - had a higher fertility rate than those who did not. The men in the new study, however, were smoking, on average, two joints a week.
Only 5% of cannabis users had sperm counts below 15 million/mL, the World Health Organisation's threshold for "normal" levels, compared with 12% of men who had never smoked cannabis.
"If you look at my boys, the one thing they do do is win", he said on Doug & Wolf on Phoenix radio station 98.7 FM on Tuesday. Ball added that his son is struggling with the Lakers because he's being used as a 3-and-D type of player.
They are also "surprised" the French club have asked for a cut of the transfer fee amid a private-funded search. It is thought Nantes will begin legal action if they do not receive a payment within 10 days.
The mobile operator has said the merger will help it roll out its 5G network and better serve rural parts of the US. T-Mobile is still trying to complete its acquisition of Sprint and merge the two into the New T-Mobile.
During the press conference, Varadkar conceded that Ireland is now preparing for the "fiasco" of a no-deal Brexit . He said Britain's recent political instability was yet another proof of why the backstop was needed.
I'm a fairly intelligent guy, that's why it kind of shocked me, and then I came down to Earth after having these awful feelings. The 33-year-old singer was performing in Sydney, Australia as part of her No Shame Tour when she announced the dedication.
President Donald Trump had not yet decided whether to meet with Chinese President Xi Jinping on the trade dispute. The study also underlines that bilateral tariffs "do little to help domestic firms in their respective markets".
The study suggests that the sharpest increase in obesity-related cancer incidence is in adults aged 25 to 49. These cancers include multiple myeloma, colorectal, endometrial, gallbladder, kidney and pancreatic.
Heat ship Johnson, Ellington to Suns
He will make just over $20 million this season and just over $21 million next season before becoming an unrestricted free agent. He is scheduled to make $19.2 million this season and another $19.2 million next season if he exercises his player option.
Kings send Shumpert to Rockets in three-team trade
Both players joined the Cavaliers two days earlier in a trade that sent Rodney Hood to the Portland Trail Blazers . He is expected to play a significant bench role for the Rockets in their Western Conference playoff push.
How a woman's brain will stay sharper longer
The study was recently posted in the journal Proceedings of the National Academy of Sciences of the United States. That is based on their use of glucose, and how it is burned for energy, which can affect brain performance.
John Wall ruptures Achilles after heel surgery
Wall's four-year "supermax" contract extension will kick in next season with an annual salary starting at $37.8 million. Wall, 28, had left heel surgery days into the new year after consulting with a foot specialist.
Clippers Trade Tobias Harris to Sixers
Harris, 26, leads the Clippers in scoring at 20.9 points per game and rebounding at 7.9 boards per game. Here's hoping we get more blockbusters to shake up the league before Thursday's deadline passes.
Texas man dies after e-cigarette explosion
When he began inhaling from the pen, it was like "a shotgun that went off in his mouth", said his mother, reported Fox News. In May of last year, a 38-year-old Florida man died from a "projectile wound" caused by an exploding e-cigarette.