It's not clear what link you're trying to encourage people to read. That link you posted takes folks to a page containing various other links. Might be more helpful to post the actual text of what you're referring to.

As far as dependence is concerned, the official story is that mj doens't cause physical dependence, but you'll see from reading on this site and researching other weed-related information sites that psychic (psychological) dependence can indeed develop for some people. I've read several posts here by people who feel strongly that they have psychological dependence on weed, and I believe they're speaking truthfully. Just because it's not addictive in the same way that opiates are doesn't mean that people can't come to rely overly heavily on it.