It is important. It's supports the notion that grass is less harmful than tobacco or beer and no more of a "gateway" to narcotics than coffee is.
Not that grass is harmless, its just that the things some folks imagine are really off the wall. I smoked enough pot in the 70's to float the Hindenberg, I was literally stoned every waking moment for 10 years. For me it was a "gateway" to academic achievement, career success, financial prosperity, hundreds of friends, and much love, knowledge, and happiness.
I'll honestly tell you the two things about marijuana that are bad.
1. You can get arrested.
2. Complacency. This is no chit. Marijuana definitely will allow you to be content doing almost anything including nothing at all. It can make an already complacent personality type into a pot-head who is satisfied with achieving nothing and doing little. Even those of us who are motivated and ambitious have experienced the contentment that pot offers and realize that it can make you lazy. Worse, it can turn achievers into dreamers. This can be fabulous for an artist or a writer but can prove to be a distraction for those who must focus on their work and their families.
Rather than being led to "hard drugs", most pot heads are eventually led to cutting way back and quitting (easy to do, no withdrawal whatsoever) simply because it can get in the way of personal achievement by making one far too content with whatever they are doing.