Effects of marijuana on sexual performance

I must say that I hate drugs. I really do.
Nowadays, smoking weed is like smoking cigarettes, almost everybody is doing it. It is so common that it makes me sick. I can't find pleasure in smoking, but that's just me.
Anyway, the point of this post is different.
We have met this couple and both of them were heavy marijuana smokers. We liked them a lot, but we couldn't get through this habit.
Despite this, the guy had major erection problems. We thought that it was because of the weed.
After a few research, we found out that yes, that was the answer.

So, guys, maybe you should stop doing this. Just a piece of friendly advice! :)