Cannabis | Hastings Prince Edward Public Health


Check out the topics below to learn more about cannabis.

Cannabis can Affect Your Health

Most people who occasionally use cannabis will not experience negative consequences to their health over time. Some people will experience harm, especially people under 25 and those who use everyday or a few times a week. Not using cannabis is the best way to avoid potential risks to your health.

Some research shows that the CBD (cannabidiol) found in cannabis may help treat specific medical conditions. Hastings Prince Edward Public Health encourages anyone who is considering the use of cannabis for medical purposes to talk with a health care practitioner and to not self-medicate or access cannabis from the Ontario Cannabis Store for medical purposes.

Cannabis is a plant that has hundreds of chemicals. Some of these chemicals are called cannabinoids, including THC (tetrahydrocannabinol) and CBD (cannabidiol). THC is psychoactive, meaning it affects your brain to create a “high” feeling, while CBD is non-psychoactive. Some research shows that CBD may help treat specific medical conditions.

Leaves and buds from the cannabis plant can be smoked or vaped. Cannabis can also be used to make oils and waxes that are either smoked, vaped, eaten or drunk. 

Cannabis can affect people differently. It can make you feel happy, relaxed and talkative, or it may cause unpleasant effects that can include confusion, sleepiness, anxiety, fear, panic, paranoia, delusions or hallucinations.


Know how Cannabis Affects You

There is still a lot to learn about cannabis. Here are a few things to know, so you can keep your mind and body safe and healthy:

  • The effects of eating or drinking cannabis take longer to feel and last longer than smoking or vaping. Different strains of cannabis and the way you use it can have different effects. The effects of smoking or vaping cannabis can be felt within minutes and can last up to six hours. It can take anywhere from 30 minutes to two hours to feel the effects from eating or drinking cannabis. These effects can last up to 12 hours.
  • Cannabis smoke can be harmful to your lungs. Inhaling any kind of smoke can harm your lungs. Burning cannabis and rolling papers produces smoke that has the same harmful chemicals and carcinogens as the smoke caused by burning cigarettes. These harmful chemicals are made by combustion and are not found in the cannabis plant. Smoking cannabis often can lead to chronic bronchitis, which is a cough that doesn’t go away, lots of mucus and wheezing. Smoking cannabis can also lead to more infections in your lungs, like pneumonia.
  • Cannabis use can lead to dependence. Regular cannabis use can lead to psychological and physical dependence. The risk for dependence is higher for frequent users and people under 25. If you are dependent, you can experience unpleasant feelings called withdrawal symptoms when you reduce how much you use or stop using completely.
  • Cannabis can lead to mental health problems. Using cannabis can increase the risk of experiencing psychosis and schizophrenia, especially if you are a teenager, use everyday or almost everyday, or someone in your family has or had these conditions.
  • Cannabis impairs your ability to drive safely. Cannabis impairs the skills everyone needs to drive safely, like judgement, quick response time, attention and coordination. Nobody should use cannabis and drive. For more information visit


Use Responsibly

Using cannabis can come with risks, especially for people who are under 25, use often, or use high levels of THC. These tips can help you make a responsible choice that considers your mental health, physical health, and safety.

Have more cannabis free days

What to know: Using cannabis every day or a few times a week can increase the risk of negative effects to your mind and body.

How to reduce your risk: Limit your cannabis use to one day a week, at most.


Go easy on your lungs

What to know: Cannabis smoke has many of the same chemicals as tobacco smoke.

How to reduce your risk: Instead of smoking, use a different method like vaping or edibles, but be aware that these may have their own risks. If you want to smoke, take short shallow breaths and exhale right away. It only takes a few seconds for the THC to be absorbed through your lungs so you will still get high without holding the smoke in your lungs.


Pace yourself. Start low. Go slow.

What to know: Different strains of cannabis and the way you use it can have different effects. Synthetic cannabis, like K2 and Spice, are stronger and more dangerous than natural cannabis products. Using these can lead to severe health problems, such as seizures, irregular heartbeat, hallucinations and, in rare cases, death.

How to reduce your risk: Start with a small amount, especially if it is your first time, and wait 30 minutes or more to feel the effects before deciding if you want to have more. Consider using products with low THC and some CBD. You can know how much THC and CBD is in your cannabis by reading the label on the package. If you are sharing with a friend, ask them how much THC is in their cannabis. Don’t use synthetic cannabis products.


Stick to one drug at a time.

What to know: Alcohol and cannabis cause impairment. Using more than one drug at a time can lead to unpredictable changes in how you think, feel and act, which can increase your risk of injury.

How to reduce your risk: Avoid using cannabis with alcohol or other drugs at the same time.


Leave tobacco out of the mix.

What to know: Tobacco is harmful to your health and contains nicotine that is highly addictive. Nicotine can make it hard to cut down or quit. Smoking cannabis with tobacco means you are getting the chemicals from the smoke and are at risk of becoming addicted to tobacco.

How to reduce your risk: If you choose to smoke, don’t mix cannabis with tobacco. If you are using with friends, make sure you ask if they added tobacco.


Share with care.

What to know: When you share your joint, bong, vaporizer or whatever else you use, you may also be sharing germs and infections from your mouth and saliva with each other.

How to reduce your risk: Try to avoid sharing with other people.


Plan a safe ride.

What to know: Cannabis impairs the skills everyone needs to drive safely. The effects can last six to 12 hours and could be longer depending on the person and the product used.

How to reduce your risk: If you are planning to use cannabis, plan a safe ride with a sober friend, use public transit, or call a taxi.


Use Legally

Individuals 19 years and older can buy and use cannabis legally. There are restrictions on where you can use, how much you can have in public and grow at home, and restrictions on driving after consuming cannabis.

What is the legal age to buy cannabis?

You must be 19 and older to buy, use, possess and grow non-medical cannabis. This is the same as the minimum age for the sale of tobacco and alcohol in Ontario. It is illegal to share cannabis with anyone who is under 19 years of age.

Where can I buy cannabis?

Individuals 19 years of age and older can buy cannabis at an authorized retailer or through the online Ontario Cannabis Store. Look for the authorized cannabis retail seal to make sure it is a legal store. Legal stores have to get their cannabis from licensed producers. Licensed producers complete testing for quality control and accurate THC levels.

Where can I use cannabis?

Smoking and vaping of cannabis is permitted in some outdoor public places. A complete list of smoke-free and vape-free spaces is available on the Government of Ontario website. Municipalities, landlords, condominium boards and co-operative housing boards may place additional restrictions on cannabis use. Check which rules apply to your residence.

In Hastings and Prince Edward Counties, some municipalities have passed by-laws that cover entrances to municipal buildings, certain transit properties, and municipal parks. As these bylaws are often changing, please contact the Tobacco Talk Line for a current listing of restrictions: or 613-966-5500 ext. 600.

How much cannabis can I have in public?

You can have a maximum of 30 grams (about one ounce) of dried cannabis, or the equivalent in other forms, in public at any time.

Can I grow cannabis at home?

You can grow up to four plants per residence (not per person). Landlords, condominium boards and co-operative housing boards may place restrictions on growing cannabis. Check which rules apply to your residence. Growing at home can cause health and safety risks in your home. If you choose to grow cannabis at home, follow these environmental health and safety tips.

What are the laws for driving after using cannabis?

If you are 21 or under, a novice driver, or a commercial driver, there is a zero-tolerance law for impaired driving, meaning you cannot have any cannabis in your system. To learn more about the laws and penalties for drug impaired driving, visit


For Parents

Using cannabis as a teen can change the way the brain grows and how it works. Help your teen reach their full potential: Talk early, often and openly about cannabis.

For Preconception, Pregnancy, Breastfeeding

Cannabis use may affect the ability to become pregnant. There is no known safe amount of cannabis use in pregnancy or when breastfeeding.

For Additional Cannabis Education Resources


Know Where to go for Help 

Don’t hesitate to get help if using cannabis is affecting your life. If you are concerned about yourself or someone else, there are places where you can turn for help.

For referral to addictions and mental health services in Hastings and Prince Edward Counties, call 613-310-OPEN (6736)

To access online referral and locations for in-person intake, visit


Page content has been adapted with permission of Ottawa Public Health. For educational and non-commercial purposes only.