Sperm is affected by heavy weed smoking (Picture: Getty)

Regular marijuana smokers could face fertility problems because the drug makes sperm ‘swim in circles’.

Canadian scientists have found that heavy weed smoking ‘mellows’ sperm and can cut counts by a third.

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Dr Victor Chow, of the University of British Columbia, told Mail Online: ‘The weight of the ­evidence is that marijuana ­probably has a negative impact not only for sperm counts but sperm function.’

Previous research found that pot can cut sperm counts and suppress ovulation in women.


While it is not clear why this happens, this new study could shed some light on the issue.

Smoking pot could cause fertility problems in the future (Picture: Getty Images)

Marijuana can increase heart rates and affect blood pressure and increase the risks that babies can be born smaller than expected.



An Australian study also revealed there are differences in the way users and non-users walk, as those who smoke tend to have stiffer shoulders, more flexible elbows and quicker knees.

But there were significant differences between the balancing abilities and neurological functions, the website has reported.

More research into how the drug affects movements has been called for as marijuana continues to be legalised in America.

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