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Cannabis (Marijuana)

image of cannabisCannabis is the most commonly used substance in Ontario, aside from alcohol and tobacco.  When consumed (e.g., smoked or eaten), cannabis products can cause short-term psychoactive effects. Cannabis is used for non-medical, medical and cultural purposes. There is a growing body of evidence on the therapeutic and adverse health effects of cannabis.

Evidence Brief: Risk Factors for Simultaneous Use of Alcohol and Cannabis

image of a glass of beer and cannabis 

This Evidence Brief identifies risk factors associated with simultaneous alcohol and non-medical cannabis use. These can then be used to potentially highlight populations or groups who may be at increased risk for this behaviour.

Evidence brief: Odours from cannabis production

image of cannabis plants 

This Evidence Brief explores potential links between cannabis production odours and health effects.



Evidence Brief: Driving under the influence of Cannabis and risk of motor vehicle collision

image of car keys and cannabis 

This Evidence Brief addresses three questions:

1. What is the prevalence of DUIC in Ontario and Canada?

2. In jurisdictions where new cannabis legislation was introduced, did the prevalence of DUIC change following the change in legislation?

3. Does DUIC increase the risk of motor vehicle collision as compared to driving sober?​

Evidence Brief: Driving under the influence of Cannabis - risk factors and interventions

image of a sobriety checkpoint sign 

To better inform interventions to prevent driving under the influence of Cannabis, this Evidence Brief asks two questions:

1. What are risk factors for cannabis-impaired driving?

2. What interventions have been shown to prevent or reduce DUIC?  



Evidence Brief: Health Effects of Cannabis Exposure in Pregnancy and Breastfeeding


This evidence brief addresses:

  • The child and youth outcomes associated with exposure to maternal cannabis use during preconception, pregnancy or breastfeeding
  • The current clinical recommendations for providers caring for reproductive-age, pregnant or breastfeeding women who may use cannabis





Related Links



Health Promotion, Chronic Disease and Injury Prevention

Page last reviewed:
Page last updated: 2018-11-29 1:40 PM
Uncontrolled print copy. Valid only on day of Print: [date]
Page updated on [date/time] 2018-11-29 1:40 PM
© , Ontario Agency for Health Protection and Promotion