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Cannabis Fact Sheet 

This mood-altering drug made from the leaves and flowering tops of the Indian hemp plant, Cannabis Sativa. It is the most widely used illicit drug in the world.

Common Forms of Cannabis

Marijuana dried, crumbled leaves & flowers which might look like herbs.

Hashish refers to the dried resin from the top of the cannabis plant.

Hash oil dark, thick liquid made from hashish.

Method of Use

Cannabis is mainly smoked. The marijuana is rolled into thin cigarettes or put into a pipe. Hashish may be smoked in a pipe or cigarette or pressed between heated knives; the vapour is then inhaled though a cylinder. The drug may also be eaten; it may be chopped up and combined with food.

Effects of Cannabis

  • euphoria
  • increase in heart rate
  • distortion of perception in time or space
  • interference with coordination and reactions
  • drowsiness and confusion

Signs of Use

  • red eyes
  • laughing, giggling
  • confusion, lack of concentration
  • loss of coordination
  • slowed speech
  • spontaneous desire for food (munchies)

A single, large dose may produce panic attacks and/or hallucinations. As well, continued use may result in significant impacts on other aspects of the person's life/health.

Impacts of Use

Cannabis contains over 400 chemicals. The particular chemical which makes a person "stoned" is THC (short for delta-9-tetrahydrocannabinol). Cannabis is much stronger today than in the 60's and 70's; the amount of THC has increased from about 1% to 8-12% and at times over 20%. This increase results in much greater effects and impact.

THC is fat-soluble and so is stored in fatty cells in the body. Water-soluble drugs such as alcohol and LSD leave the body within a day or so. If a person smokes one joint of marijuana, the THC can stay in the body for up to 3 weeks. In a regular, heavy user traces of THC may be detected 30 days after last use.

The Brain and THC

Use may cause:

  • short-term memory loss

  • impairment of cognitive learning (especially school-work, problem-solving)

  • loss if interest in and motivation for sports, work, education, and/or goal achievement

The Body and THC

Use may cause:

  • impairment of lung function - the tar content is 7 to 10 times higher than tobacco. A person may experience an increase in colds, bronchitis or greater difficulty with pre- existing problems such as asthma.

  • interference with white blood cells which protect the body from infection

  • impact on sex organs and hormone levels. THC lowers testosterone levels and may alter the menstrual cycle

  • constant fatigue and loss of energy

Other Problems Include

  • conflict with family and friends

  • increase in other high-risk behaviour; for example, unprotected sex, legal problems

  • increased accidents including car crashes

  • dependency and inability to stop using without help/treatment

Withdrawal Effects

  • anxiety, nervousness

  • sleeping problems

  • loss of appetite

Drug Dependency Services, Central Region, 1999

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