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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 version: 17 Aug 2015.

Abstract:

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

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:

Some researchers are of the opinion that:

However, these statements have not been proven.

More Information
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