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UK: Cannabis: Dr Thomas Stuttaford answers your questions

The Times

Wednesday 08 Jun 2005

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Q: Our 25-year-old son has been smoking cannabis since he was 16. When he
was 17-18 he began self-harming and was treated with Prozac for six months
to a year; he also spent about a week in hospital. He ignores any
suggestion that he should give up cannabis and probably wouldn't read your
article if we gave it to him. Can you suggest any literature that would
help him realise what he is doing to himself and advice as how we can
encourage him to give up? Marion and Roger Townshend, Trowbridge

A: I am very sorry to hear about your son. Obviously we can't discuss his
own case in detail, as I haven't met him, but we can draw general
conclusions from the points you raise. These may not all apply directly to
your son. I would always be very careful about treating a patient with
possibly psychotic symptoms, and a heavy cannabis smoker and therefore in
danger of having a psychotic breakdown, with Prozac. In these cases I feel
that the treatment should have at least an element of antipsychotic
therapy. SSRIs, of which Prozac is one, can precipitate psychotic symptoms
in vulnerable patients. In the recent Panorama programme on the effect of
SSRIs on some patients who were depressed, the conclusion of the experts
who analysed the cases was that when there had been disaster it wasn't so
much the drug, but its misprescription, that was at fault.

I took part in the discussion after the programme and it was worrying that
so many patients in whom the depression was part of the negative
symptomatology of a psychosis were treated with an SSRI without any thought
of providing an antipsychotic. Little wonder that occasionally people had
become aggressive or suicidal.

I can't advise you on literature. However one of the best pamphlets on
cannabis was produced by the National Institute of Public Health in Sweden
- Adverse Health Consequences of Cannabis Use, A survey of scientific
studies into the range of damage to health caused by cannabis. It was
produced by Socialstyrelsen, The National Board of Health and Welfare in
Sweden. It has been translated into English.

Q: My boyfriend smokes cannabis every night to help him "relax". I always
tell him how bad it is for him; it has caused many arguments and almost
broken us up many times. He tells me I should stop trying to control him
but he obviously has a psychological (if not physical) addiction both to
the cannabis and the tobacco he mixes it with, and he=92s been smoking more
and more since he moved in with his current flatmates. He is doing a
fantastic PhD but he is going into work less and less because he feels
lethargic in the mornings. He is blaming the PhD, saying it is boring. How
do I make him see it's the weed causing the problem and not the PhD? Kate
Palmer, London

A: Nobody doubts that cannabis gives rise to psychological dependence.
There is discussion about the degree of physical dependence, but no
argument that heavy use of it leads to tolerance. There are withdrawal
symptoms when cannabis is discontinued. These include irritability,
sweating, headache and abdominal upsets. I would suggest that the first
move is to encourage your son to leave his present flat. It is hard to
renounce any habit if all those around you are carrying on with it.

The more I talk to schoolteachers and university lecturers, the more often
I hear the story of the bright student whose performance falls away as the
result of heavy cannabis smoking. A problem is that a cannabis smoking
student rarely has insight, and either ignores his deteriorating
performance or blames other factors. Girlfriends are about the only close
friends and relatives who might have the power to persuade him to change.

Q: I am a migraine sufferer and for ten years I took paracetemol plus
antihistamine before bed, which prevented me from having disturbed sleep
and waking with a migraine in the morning. I don't know the danger of doing
this for ten years; my GP says it's OK but I have reservations. I started
to use cannabis instead, eating 2g of buds before bed. It worked a treat
and after nine months my supplier went away and I was about to go back on
the paracetemol but the symptoms had gone. Of course this may have been
spontaneous and I make no claims about the efficacy of cannabis. It is the
relative risk between cannabis and paracetemol that I am interested in.
Alastair McGowan, Cardiff

A: Some migraines will improve with a tranquilliser and analgesic, whether
paracetamol plus anti-histamine or cannabis. I would agree with your GP
that the anti-histamine and small dose of paracetamol wouldn't do any
long-term harm, although sedative anti-histamines tend to give rise to a
slight hangover the next day, so that you may feel depressed.

The risks of a daily dose of cannabis are considerably greater. Cannabis
risks can be divided into two, the physical and mental. The worst mental
risk is that it will cause breakdown in someone who has a genetic
vulnerability to schizophrenia or bipolar disorder (manic depression). This
recent research has shown that this genetic liability affects one in four
of the population, but the chance of this susceptibility being unmasked
varies according to the dose, the genetic make up of the person and other
factors. Regular cannabis taking even without producing a psychotic
reaction may induce a cannabis smoker=92s personality =AD being excessively
laid back, casual, forgetful, unambitious to an unusual degree and, in
fact, generally idle but self-satisfied!

Cannabis smokers are much more liable than other smokers to develop cancer
of the lung, head and neck (including the mouth), and less frequently some
other malignancies. There have been several reports for adverse effects on
the cardiovascular system, long-term ill effects on vision, damage to sperm
and to pregnancies.

In addition to the factors you mentioned, psychosis caused by cannabis use
carries the stigma of mental illness and is something that individuals and
families may want to put behind them rather than shout about. Also, they
are too knackered dealing with the problem to campaign.


Q: Our student son had a manic episode last summer, quite possibly
triggered by cannabis. What can we do to help publicise this? Are there any
campaigns we can add a voice to? Name and address withheld

A: A very good point. Parents may well want to keep quiet about the whole
business. I should write to your MP. It is very interesting to study the
background of the people appointed by this government to the advisory
council for the misuse of drugs. It is quite extraordinary how many of them
have been openly in support of the liberalisation of the laws relating to
cannabis. It is equally extraordinary that none of the great experts on
schizophrenia have been included in the committee even though it and crack
are the two most common causes of acute psychotic breakdown. As well as
writing to your MP, it would be as well to write to your local paper.

Q: If there is a link between cannabis and mental health, why has there no
been an increase in cases to match the increase in cannabis use we've seen
over the past 40 years? In South London (Maudsley), Zerrin Atakn claims to
have observed a doubling in this time, but that is nothing like the
increase in the rate of cannabis use. There are many other variables which
could have caused it. Derek Williams, Norwich

A: There has. The incidence of psychotic disease is under-rated, as there
is, not unreasonably, a reluctance to give someone a diagnosis that,
regrettably, still has a stigma attached to it. Furthermore, if lesser
conditions are exacerbated, or induced, by cannabis, so that the patient
suffers from (for example) a schizotypal personality disorder rather than
schizophrenia, this wouldn't be recorded. The evidence that cannabis is
involved in psychotic breakdown is now so strong (it has been around for at
least 40 years), that even the Department of Health has acknowledged it.

Q: Do you think that, given the evidence of liver damage and other
sicknesses, that cannabis causes more damage than alcohol? As cannabis can
be taken safely by some individuals, what do you think the impact is of
criminalizing millions of people for their choice of recreational drugs? Is
the government not grossly out of touch? Name and address withheld

A: Both an excessive alcohol intake and cannabis smoking may cause lasting
physical and mental ill-health. If alcohol is to cause permanent damage to
the drinker it usually has to be taken for many years. Heavy cannabis
smoking can cause psychotic breakdown in a genetically vulnerable person
just after one or two episodes. I have seen this happen. Although cannabis,
unless taken in very large amounts, may not cause psychotic breakdown in
those not genetically vulnerable, it does give rise to a certain
personality type. Whereas it is right and proper that people=92s lives are
their own, it is unfair for people to adopt a habit that in many cases
leads to the development of a lifestyle that demands financial support from
the rest of the community.

Q: What anti-smoking campaigners fail to recognise is that people who need
their nicotine fix will assuredly find something to replace it. At least
the Quakers, concerned about too much drink, had the good sense to offer
something else - chocolate. Cigarettes may cost the NHS but the taxes
levied more than offset this. Cannabis and its friends cost the community
both in NHS treatment and in more direct ways, such as theft. Can we have
some lateral thinking? Ross Coad, South Petherton, Devon

A: This problem has often struck me. What are the nicotine-addicted going
to do when they can no longer smoke? I have just returned from a visit to
Scandinavia, where many of the doctors are critical of our condemnation of
taking nicotine through the cheeks (teabag nicotine). These bags were
heavily criticised by British doctors when they were introduced into this
country about twenty years ago. However the Scandinavian experts I spoke to
said that no research had actually shown an increase in head and neck
cancer in those who like to have a nicotine packed teabag nestling and
leaking between their cheek and gums.

Q: Is there any evidence that cannabis is harmful if ingested or smoked
without tobacco? I'm talking about physical dangers, not mental risks -
which I have no doubt are very real. Iain Dobson, Edinburgh

I am afraid so. There is even a risk of psychotic changes in patients who
have been given cannabis as a medicine in the trials of its use for the
treatment of intractable pain. Physical side effects, as well as these
mental ones, are also found, but in these cases the risk-benefit equation
might make it worthwhile. Cannabis has an effect on the cardiovascular
system, on the eyes and lungs.

Q: I have been a regular dope smoker for about five years. My intake
varies from 5-10 joints a week to that amount in one night. I do feel it
has negative effects on me - memory and slight dopiness, usually after a
heavy night. I also feel it affects my nervous system. I take daily
vitamins and Vitamin C when feeling low, work out in a gym and eat as much
fruit as possible. I have an ongoing battle to give up smoking tobacco, but
my intake is, on or off, a pack a day for a few weeks and then none for
months. Is there anything else you can recommend, a supplement or actively
I could try to help maintain my immune system? Name and address withheld

A: Thank you for writing. I am interested to hear that you have noticed
the development of a cannabis personality, poor memory, slight dopiness,
etc, as well as some adverse physical effects. I would certainly recommend
a good quality multivitamin and mineral supplement and should take two,
rather than one tablet a day. I would also discuss your problem with your
own doctor as he, or she, might be able to obtain cognitive therapy to help
you to give up both the cannabis and the nicotine. Continue with your
excellent diet.

Q: My son, aged 33, smoked cannabis and is now schizophrenic. It is quite
likely that he was genetically susceptible. He is under the local
equivalent of a mental health act section order, being treated with
respiradon. He continues to harbour a variety of delusions, but absolutely
refuses to accept that he is delusional. The psychiatrist's only answer
seems to be to increase the dose and the GP has no alternative suggestions.
My son is articulate and intelligent, but is becoming increasingly
depressed and doesn't venture out of the house. Are you aware of any other
treatment that we could try? Name and address withheld

A: I am sorry for you. I know the difficulties you must have suffered and
are continuing to suffer. Risperidone is only one of many of the new
generation of antipsychotics. There are many others. Very often it is a
matter of choosing the right one to suit the patient. The very small
differences in the atypical antipsychotics may be just enough to help the
patient. There have, for instance, recently been good reports of Abilify
aripiprazole.

 

 

 

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