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The aim of Web4Health is to give good and useful free medical advice, help and self help in the areas of mental health, psychology, personality disorders, relationships, stress, anxiety, depression, emotional abuse, substance abuse, sexual abuse, types of mental illness, etc.

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Negative Effects Marijuana/Cannabis/Haschish

Written by: Wendy Moelker, Psychologist in charge, tutor, Emergis center for mental health care, Goes, the Netherlands.

First version: 22 Jul 2008. Latest revision: 01 Dec 2008.

Question:

 What are the negative effects of long-term use of cannabis/hashish/marijuana?

Answer:

Smoking one or more joints a day during a year or longer is considered long-term use. However, this varies from researcher to researcher.

The health risks of this long-term use are:

  • In some cases high quantity users can experience feelings of anxiety, depression and be seriously unwell.
  • Cannabis influences driving ability.
  • Smoking cannabis causes carcinogens to enter the body.
  • During pregnancy, cannabis can have negative consequences for the fetus.
  • Long-term use of cannabis may affect thinking, emotions and feelings.
  • In some cases, long-term use of cannabis can lead to dependence and abuse.
  • Cannabis can provoke a psychosis in people who are sensitive to it. More.
  • Some researchers are of the opinion that:
  • Cannabis is a first step to the use of hard drugs.
  • Cannabis has negative effects on the immune system.
  • Cannabis influences fertility.
  • Cannabis causes schizophrenia. More.
  • Cannabis leads to apathy and loss of interest.
  • Cannabis can cause anger, especially when trying to stop using Cananabis.

However, there is no proof for these statements.

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