How does marijuana kill sperm cells?

Yes. It will also give you man breasts.Smoking cigarette will make you impotent. Smoking cigarettes thickens your blood and closes your arteries and vessels. When this happens in your penis the arteries cannot get blood in them to make your penis hard. It's not rare but very common, This is why so many men use Viagra now.Don't smoke too much weed and you really should Not smoke cigarettes.