New Study Shows Marijuana Affects Sperm Size, Shape & Quality

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A new study has shown that smoking marijuana could cause infertility in males as it affects sperm quality and production.

In a study published in the medical journal Human Reproduction, researchers analyzed many different lifestyle factors that could possibly have an impact on male infertility.

The study was the largest of its kind, examining how habits such as smoking and drinking alcohol affected men’s sperm size and shape – also known as sperm morphology.

Reliable sperm morphology data was only available for 1,970 of the men recruited, and of this group, 1,652 men produced “normal” samples of sperm – meaning over 4 percent of their sperm was the right shape size. The other 318 men had abnormal samples, meaning less than 4 percent of their sperm morphology was correct.

When cross analyzing the sperm samples with the men’s lifestyle habits and other factors, the researchers found only two strong correlations. The men with abnormal sperm samples were nearly twice as likely to have ejaculated during the summer months (from June to August), and they were much more likely to have abnormal sperm if they had smoked cannabis in the three months prior to ejaculating.

“I do know there is some work in laboratory animals that suggests [marijuana] can affect the way the DNA in the sperm is packaged together, and that’s significant,” Dr. Alan Pacey, senior lecturer in andrology at the University of Sheffield in England, said. “When sperm are made, the DNA they maintain has to be packaged in the head very tightly, and when that process doesn’t work properly, you get an abnormal sperm. So the cannabis is maybe interrupting that DNA folding.”



Quo non Ascendam. Writer. E-mail:

1 comment

  1. the greatest plant in the universe is almost free, LET FREEDOM RING! 13

    ENLIGHTENMENT…i was a brainwashed evil, mean, christian conservative until i tried it at 17 years old…i hated gays, immigrants, women’s rights, blacks, marijuana, i was Rush Limbaugh’s #1 fan….until i smoked marijuana….changed the world

    1000s of my friends and family have grown 30-99 plants for 20 years, thanks for keeping prices high and NORCAL wealthy…#1 crop in cali = $15 Billion Untaxed…

    “any doctor against marijuana is a doctor of death” – cali secret 420

    from 0 states to half the country, from low 20% approval to almost 70%, cali runs this planet by 2 decades, time to tie marijuana to the 2014, 2016 elections, out with the old, in with the new

    20 years behind us southern states, sad and scary….nobody denies freedoms like the south, nobody…the top ten incarcerators on the planet are southern states and more blacks are in prison then were slaves before the civil war…even if marijuana reforms did pass the republiCANTS in charge would deny you all your freedoms, centuries of practice…no matter though, we never planned on getting your backwards brethren from day one, half the country already but not one southern state, lol…not 1….the new generations are taking over in the south and they are nothing like their freedom denying parents, let’s ride…

    Deaths by Alcohol: Millions
Deaths by Tobacco: Millions

    Deaths by Prescription Drugs: Quadrupled in last decade
Deaths by Guns: Millions
Deaths by the food we are fed: Millions
Deaths by Marijuana: 0, ever…they are killing my American family while denying freedom

    love and freedom forever


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