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Negative Effects Marijuana/Cannabis/Haschish

Abstract: Long term use of cannabis (marijuana, haschish) can increase negative feelings, can lead to dangerous driving, can cause cancer, and more.

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Negative Effects Marijuana/Cannabis/Haschish

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Question(s): 
Written by: Wendy Moelker, Psychologist in charge, tutor, Emergis center for mental health care, Goes, the Netherlands.
First version: 22 Jul 2008.
Latest revision: 17 Aug 2015.

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, these statements have not been proven.

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