Yes,it'll make it more expensive,however the legal CannabisMarket will be the main one,for one simple reason reason: Quality control.
Unless of course you're saying that in the Netherlands most people buy from black market dealers .
Please show me the medical definition of Cannabis Psychosis.Also please show me the research and papers that conclude that Cannabis CAUSES Schizophrenia.
By the way,I take it you realise that most psychotic breaks reported to Hospitals are a result of Alcohol consumption.... ?
Regulating Cannabis and getting more people to consume it would certainly be much better than drinking alcohol.It really is amazing how many people underestimate how dangerous alcohol is.
By the way,Cannabis will not remain illegal for much longer... Take a look at what happening in the US and elsewhere,the war on drugs is lost and big changes are afoot. Thank God.
Addict or not he certainly seems a good bit more knowledgable on the subject than you are Marty.

No disrespect,but I'd suggest you do a bit more research,you've really been fed a lot of Propaganda there.Can't blame you though,every War relies on good propaganda,especially the un-winnable ones.
So the Dutch cannabis market is still in the hands of crooks then? Coffee shops a figment of the imagination?
TBH the reasons you cited will make weed more expensive but also quality controlledPeople will pay for quality.
Will there still be a black market? Of course,but nowhere near what we have now...
Just to make things sparkling clear,I actually totally agree with this Chief Constable:
http://m.bbc.co.uk/news/uk-24320717.
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I'm really sorry to hear about your sister in law Marty.Can you please define 'plain fried' though.
Please don't say she's brain damaged and I also take it she never ever drank any alcohol since you are absolutely convinced it was the cannabis? No history of psychiatric problems?