I know this is going to get me a bunch of hate-mail, but I just could not resist this headline after reading this article:
I find most marijuana-legalization advocates particularly annoying when they try to say that something that messes with your brain chemistry is somehow healthy and harmless. Any time you mess with brain chemistry, you are increasing the odds of causing lasting damage. The brain is not meant to be tampered with, and even well-meaning attempts to regulate brain chemistry backfire with horrendous results: just ask someone who has gone through difficulties with depression medication.
Mental health professions who work with schizophrenics are often the loudest critics of marijuana usage, because they see how bad it is for schizophrenics. It can make someone with borderline schizophrenia go full on, and take someone with full-blown schizophrenia and make them totally untreatable. Marijuana usage is guaranteed to make psychotropic medications totally ineffective, as well as worsen the condition.
Because THC, the active ingredient in marijuana besides all the nasty chemicals that make cigarettes look like a healthy alternative (http://www.telegraph.co.uk/health/healthnews/9311783/drugs-cannabis-lung-cancer-BLF.html), is naturally occurring in the body, its effects are different from all other drugs. It is, indeed, 'natural' but not the quantities that cannabis provides. So, the body does not have the 'fight mechanism' it has with other drugs.
I think this is why it does the damage that it does to a developing brain, which the study proves is the case. Here's another report on the same study:
What is more annoying are the people who say it is 'non-addictive.' I think I can prove that just about anything is addictive. If you can get addicted to food or sex, then getting addicted to smoking pot should not be too difficult...