Johnnytheboy wrote:
I found that report slightly confusing in that it said people who smoked cannabis were far more likely to suffer from a psychotic disease, but it also said the number of psychotic diseases per unit population had remained the same for 30 years.
Diagnosis of mental illness is not always an exact science. In recent years this has been recognised by a change in the way sufferers are labelled.
30 years ago there were relatively few diseases recognised and every diagnosis was qualified with a list of symptoms exhibited by the patient.
Today we use the International Classification of Disease system (ICD) which gives hundreds of choices according to symptoms.
So a patient who might have had 1 label 30 years ago (eg psychosis) might now have 3,4 or even more disease descriptors. All of which makes me doubt if it is possible to draw conclusions of the type you refer to. But PhD students have to have something to do.
All I can say is, 20 years ago I saw very very few cases that I could associate with cannabis use. Now I see 2 or 3 a month. My colleagues report the same .
Johnnytheboy wrote:
That implies to me a 'chicken and egg' relationship, i.e. perhaps people with a predisposition to psychotic diseases also have a predisposition to experiment with drugs.
i look forward to the day when we have an answer to that one.
I have long held the opinion that you need to have some problems with your judgement to use an illegal substance when you have no way of knowing its strength, its purity or what it might do to you.