Plant – active chemical is THC. The dried leaves and flowers are used. Hash and hash oil are more potent. If smoked, effect is felt almost immediately. If eaten, it can take a few hours for full effects. Can be smoked, eaten or vaped.

This is a guide only – know more, be safer.

Effects on the Brain

How Cannabis makes you feel

Depends on how you feel before you use, and the surroundings you’re in. You might feel relaxed, happy, excited, unmotivated, anxious or paranoid.

Effects on the Body

What Cannabis does to your body

Depends on your size/weight and health, if you’re used to taking it, if other drugs are taken around the same time, amount taken, and drug strength. You could experience bloodshot eyes, slow reflexes, memory loss, increased heart rate, a dry mouth, the munchies (increased appetite), greening or whiting out (nausea, sweating, vomiting).

Drug Duration Calculator
Staying Safe

How long does Cannabis last?

Effects last
1-4 hours when smoked. 4-10 hours for edibles.
Stays in your system for
In system
Saliva test: 12 hours for infrequent use, 30 hours for frequent use. Urine test: 10-30 days or longer
No longer detectable in your system
30+ days

Depends on:

Depends on:

  • Your Size/Weight
  • Tolerance to the drug
  • Drug Strength
  • Type of test. These time frames are based on saliva and urine drug tests. Testing equipment can vary - this is a guide only.

How do you stay below 0.05? (This is a guide only)

Men average size: No more than 2 standard drinks in the first hour and 1 drink per hour after that.

Women average size: No more than 1 standard drink per hour.

Mixing Substances

Risks of mixing Cannabis with other substances

Mixing cannabis with other drugs can have unpredictable effects and increase the risk of harm.

Moderate risk icon

Moderate Risk Substances

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High Risk Substances

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Potential Side Effects

When you take too much Cannabis

Low blood pressure




Staying Safe

Risks when taking the substance

  • Smoking cannabis can worsen symptoms of asthma
  • Regular use can cause long-term learning difficulties and memory problems in young people
  • People with a psychotic illness (or family history of these illnesses), like schizophrenia or bipolar disorder should avoid use.
Staying Safe

Harm reduction

  • Avoid tobacco as mixing agent
  • Keep bongs and pipes clean, avoid plastic bottles due to toxic fumes
  • Use vaporizer which stops combustion and reduces tar and carcinogens
  • Don't drive or operate machinery
  • Know how long cannabis stays in your system so you’ll know when it’s safer to drive, be on site or work machinery.