Not sure what's ridiculous about it--I'd love to find an original research article, but here's a link to a Medscape article on one study indicating there is in fact an increase in violence in individuals with PTSD: Medscape: Medscape Access
I don't know that I totally agree, but once again, more studies needed to get a definitive idea. Smoking Marijuana Not Bad For The Lungs - Medical News Today
Not correct. I don't know how much experience you have working with schizophrenic patients, but have you ever noticed why schizophrenics smoke like chimneys (and at a significantly higher percentage than the general population)? Also, if you observe them they often take real deep hits of their cigs. There is a reason for this. Schizophrenics have a really hard time with congnitive function such as focusing on a particular stimuli. So if you are speaking with them in an empty room and are trying to educate them (because that is what we do as nurses) the air coming through the vents, the sounds of traffic and/or people outside the room and any other noises take equal precedence to your voice. When nicotine hits the nicotinergic receptors in the brain they achieve brief moments of mental clarity, so to speak. Unfortunately nicotine's action on these receptors last a few seconds, hence the need to smoke 'em while you got 'em.
If someone makes a blanket statement that marijuana is safer than alcohol (i.e., without a qualifying statement such as abuse, addict, misues, etc., which a few did make blanket statements), I say that is a false assumption as I stated in my OP. For example, a glass of wine with dinner for most people who do not have a history of an unhealthy relationship with alcohol is less problematic than casual use of mj (whatever one might consider casual use given there are no established safe guidelines for mj use).
I did not say or even imply mj use predisposes anyone to schizophrenia. I said there is an increase incidence of mj users later meeting criteria for a dx of schizophrenia; there is no causative relationship, rather a correlation. To be clear, individuals can have the genetic predisposition for schizophrenia and never exhibit a psychotic symptom. Perhaps chronic mj use is that environmental factor (or one of many possible factors) that result in the expression of that schizophrenic gene. I'm not a genetics specialist, so I can only speculate about the possible details of the link between mj and the dx.