I don't normally look at pot to be a heavy drug. It doesn't really seem like much of a drug at all, as I've even been told by a doctor that occasional use is really no big deal. But, when does it become a real problem? Some say that it is a gateway drug that leads to heavier and harder drugs. I don't necessarily believe that. I know many people who only smoke grass and do no other drugs. But, I realized that it can also be a dangerous addiction on it's own.
I have a friend who became severly addicted to smoking weed. He was stoned 24 hours a day... literally. He would smoke from the second he woke up until the second he went to sleep. It got so bad that he was even packing his pipe before going to sleep and when he woke up in the morning he would just grab it off his night stand and light up before he even really opened his eyes. He became dependent on the drug to function. Without it, he couldn't motivate himself to do anything. It got so bad, that if there was a time that he didn't have any, he would become depressed, moody, even mean. That is bad... he was completely dependent on it to live. As a friend, I didn't know how to really recognize his problem or how to help. Fortunately, he was able to eventually ween himself off of it. But, some people that addicted might become so severely depressed, that something bad could really happen to them.
If a friend or loved one develops a problem like this, it is our responsibility to help. If you don't know how, there is a show on TV now that can help. It's called "Intervention" and it airs on A&E every Monday night at 9pm/8 central. You can see the trailers here: http://www.aetv.com/intervention
If I would have seen this show back then, I probably would have known what to do... or at least tried. The show really outlines addiction and the process of intervention and it's really important. It might help you save a friend's life.
Are you gonna watch it?