Trying Not to Laugh

9/2/17 Daily Mail:

Smoking marijuana causes fertility problems because it makes men's sperm 'lazily swim in circles' say experts
Researchers reveal cannabis leaves sperm 'mellow' causing it to 'swim in circles'
Regular use of the drug cuts sperm counts, the Canadian scientists discovered
Read more: http://www.dailymail.co.uk/news/article-4846328/Marijuana-makes-men-s-sperm-lazily-swim-circles.html#ixzz4recxsJiC Follow us: @MailOnline on Twitter | DailyMail on Facebook

I suppose in enough generations, marijuana smoking might remove the pothead gene from the pool.