Less than 10 percent of marijuana users ever exhibit symptoms of dependence (as defined by the American Psychiatric Association's DSM-IV criteria). By comparison 15 percent of alcohol users, 17 percent of cocaine users, and a whopping 32 percent of cigarette smokers statistically exhibit symptoms of drug dependence. (Source)
In this view, the paradigm for addiction is heroin: the shaking, puking heroin junkie who can’t quit because the withdrawal sickness is impossible to bear. Because marijuana cessation is not linked with such severe symptoms, the drug isn’t seen as physically addictive. And considering that most people view physical addiction as uncontrollable, but psychological addiction as manageable with proper willpower, marijuana tends not to be regarded as addictive in general. (Source)
Cannabinoids have been found to have antioxidant properties, unrelated to NMDA receptor antagonism. This new found property makes cannabinoids useful in the treatment and prophylaxis of wide variety of oxidation associated diseases, such as ischemic, age-related, inflammatory and autoimmune diseases. The cannabinoids are found to have particular application as neuroprotectants, for example in limiting neurological damage following ischemic insults, such as stroke and trauma, or in the treatment of neurodegenerative diseases, such as Alzheimer’s disease, Parkinson’s disease and HIV dementia.