Cannabis Made Clear
Debunking Cannabis Myths
Discover what people often get wrong about cannabis — and get the facts to make the right choices for you.
Last updated February 19, 2026 | Published on February 13, 2026
Cannabis is legal and widely available in Ontario — but that doesn’t mean everything you hear about it is true. From dosing and impairment to health effects and safe use, myths and misconceptions can spread fast, even when advice sounds well-intentioned. We cut through the noise with clear, evidence-based facts so you can make informed decisions.
Cannabis 101
"Cannabis is natural, so it's not harmful."
Natural doesn’t mean risk-free. Cannabis can cause short-term effects like confusion, anxiety and memory problems. Frequent or heavy use may lead to longer-term issues, such as chronic cough (from cannabis smoke), cannabis use disorder and increased risks to mental health, especially if you have a family history of mental illness.
“All young people use cannabis.”
While cannabis use is relatively common among young adults, daily use is not. In Ontario, only 13% of 20- to 24-year-olds and 8% of 16- to 19-year-olds report consuming cannabis every day or almost every day. Many people choose not to consume cannabis because they don’t enjoy the effects, want to avoid health risks or simply aren’t interested. Choosing not to use cannabis is just as common and completely valid.
“Cannabis is a gateway drug.”
Research shows a link between trying cannabis and later use of higher-risk illegal drugs, but that doesn’t mean cannabis causes other drug use. Fewer than half of lifelong cannabis consumers — and less than 10% of newer consumers — try other drugs. Alcohol, cannabis and tobacco are simply the most accessible substances, which explains why they’re often tried first.
“Puff, puff, pass — sharing is part of the culture.”
Sharing isn’t always caring. Passing joints, bongs or vapes can spread germs, bacteria and viruses, leading to respiratory or oral infections, or cold sores. To lower the risk, use your own device, clean mouthpieces or skip sharing altogether.
“Cannabis guarantees a good time, no matter what.”
Mindfulness matters when using cannabis. Before you consume, think about your set (your mindset) and setting (your physical and social environment). Having a positive headspace and being in a safe, comfortable place with people you trust can reduce the risk of an uncomfortable experience.
“Cannabis is legal, so it doesn’t need to be stored securely.”
Cannabis is legal, but that doesn’t mean you should leave it lying around. Edibles and infused drinks can look like regular snacks, and accidental consumption can seriously harm unknowing visitors, children or pets. Store cannabis sealed in its original child-resistant packaging, up high and locked away to keep everyone safe.
Impaired driving
“Cannabis doesn’t impair my driving.”
Cannabis doesn’t sharpen driving skills — it does the opposite. It reduces decision-making ability, slows reaction time, causes drowsiness and makes multitasking harder. Impaired drivers struggle to stay in their lane, maintain speed and avoid obstacles. Cannabis use also doubles the risk of a crash. Driving while impaired is illegal in Canada and treated as a criminal offence. For young and novice drivers in Ontario, having any cannabis in your system can result in serious penalties.
“I consumed hours ago and I have a high tolerance, so I’m fine to drive.”
Feeling fine doesn’t mean you’re safe. Tolerance doesn’t erase impairment — cannabis still slows reaction time, makes multitasking harder and increases the risk of a crash. The law doesn’t adjust for tolerance either: Driving with THC in your bloodstream at or above the legal limit can lead to serious penalties. Inhalation may impair you for six to eight hours, edibles for up to 12. It’s important to remember that everyone metabolizes cannabinoids differently, and even if a person feels sober, some effects of cannabis, such as drowsiness, can last 24 hours. The safest move? Plan ahead with public transit, rideshare or a designated driver.
“Police can’t test for cannabis like they can for alcohol.”
Police have several ways to check for cannabis impairment. If they suspect it, they can demand a roadside oral fluid sample that screens for THC. They can also require a Standardized Field Sobriety Test, even if the oral screen is negative. Failing these tests can lead to giving a blood sample or having a full Drug Recognition Expert evaluation. Refusing any test carries the same or greater penalties as impaired driving.
“Driving high is safer than driving drunk.”
Driving high isn’t safe. Cannabis can double the risk of a crash and affects key skills like lane control, speed management and obstacle avoidance. Combining alcohol and THC (even at low levels) is even riskier and is a specific offence with strict penalties. Both substances compromise your ability to drive, and neither is safe behind the wheel.
Lung health
“Holding in the smoke makes you feel higher.”
Holding your breath after inhaling cannabis doesn’t intensify the effects. It just increases your exposure to toxins in the smoke. Deep inhales and breath-holding lead to more irritation of lung tissue and harsher respiratory symptoms. Small, shallow puffs reduce that exposure.
“Smoking cannabis is safer than smoking tobacco.”
Both cannabis and tobacco smoke contain many of the same toxins, irritants and carcinogens linked to heart and lung illness. Deep inhalation of cannabis smoke can cause chronic coughing, wheezing, phlegm buildup and chest tightness, and long-term smoking can worsen these symptoms and may lead to chronic bronchitis. Any form of smoke can inflame the respiratory tract. Additionally, mixing cannabis with tobacco is especially harmful because you risk nicotine addiction and increase the risk of cannabis dependence.
“Vaping doesn’t produce smoke, so it’s harmless.”
Vaping isn’t risk-free. Vapour can contain toxic substances, including heavy metals that can leach into the cannabis from the device. The effects of vaping may take longer to kick in than smoking, prompting deeper or more frequent puffs and leading to overconsumption because of their typically high THC potency. Dried-flower vaporizers are believed to be lower risk than smoking, with fewer toxic and carcinogenic substances than cannabis smoke, but they’re also not harmless. The long-term effects of vaping dried flower aren’t fully understood, and even less is known about vaping concentrates like rosin, resin and distillate.
Brain and mental health
“Cannabis isn’t addictive.”
Cannabis use can lead to cannabis use disorder (CUD), which involves cravings, loss of control over use and continuing use despite consequences. Not everyone who uses cannabis develops CUD, but risk increases with frequent and heavy consumption, consuming before age 16 (or even before 25, while the brain is still developing), family history of substance abuse or mental illness, and social factors like friends’ and families’ attitudes and access. Withdrawal, tolerance and dependence are real possibilities, and nine percent of people who consume cannabis may experience problematic use.
“Consuming cannabis doesn’t cause mental health issues.”
Regular cannabis use appears to be linked to an increased risk of developing a mental health disorder, even when other factors, such as family history of mental illness or socio-economic status, are considered. The level and type of risk varies by person and by disorder. For some, the risk may be minimal; for others, it can be higher. What’s important to note is most people who use cannabis do not develop a mental health disorder.
“Weed helps you focus and improves your concentration.”
While cannabis can be consumed in a responsible way, it may cause sleepiness, changes in perception, anxiety and problems with memory and concentration. The brain continues developing until about age 25, and research suggests the prefrontal cortex — responsible for decision-making, problem-solving, memory and emotional regulation — is especially vulnerable to cannabis compounds during this time.
Ontario cannabis rules, regulations and the law
“I’m used to 100 mg of THC from edibles in the gray market — 10 mg will do nothing for me.”
Edibles from illegal sources have been found to contain less THC than advertised, with some containing only 20% of the advertised levels. Illegal cannabis products also put consumers at risk of harm from unauthorized pesticides and other potentially harmful contaminants. Edibles from the legal market are carefully dosed, and even 10 mg THC can have noticeable effects, depending on how your body processes THC. Starting low and going slow is the safest approach, because overconsumption can be risky and unpleasant.
“If a store is open and selling weed, it must be legit.”
Not all cannabis stores are legal. In Ontario, the only legal options are Authorized Cannabis Stores and the Ontario Cannabis Store (OCS). Legal stores display the Cannabis Retail Seal, check ID and sell tested products with accurate labels, excise stamps and health warnings. Unregulated stores may sell mislabelled or unsafe products, putting your health at risk.
“Legalization means anyone can consume cannabis anywhere.”
Not true — legalization comes with rules. In Ontario, you must be 19 or older to buy, possess or consume cannabis. For personal use, you can carry up to 30 grams of dried cannabis or its equivalent amount in other products, such as 48 infused beverages or 450 grams of edibles. Consumption is allowed in most outdoor public spaces, like parks and sidewalks, but not within 20 metres of schools or playgrounds. Breaking these rules can lead to fines, even for using legal products.
LEARN MORE ABOUT WHAT’S LEGAL FOR ONTARIO CANNABIS CONSUMERS
Dosing
“You can’t overdose on cannabis.”
It’s true there are no documented cases of adult death from cannabis alone, but overconsumption can be very unpleasant. When THC overwhelms your system, you might “green out” with symptoms like anxiety, vomiting or panic. These effects are temporary, but they’re clear signs you’ve consumed too much. Start with low-potency products and pace yourself to avoid overconsumption.
“Everyone reacts the same way to weed.”
False! Cannabis affects everyone differently. Your body chemistry, age, mental health, family history, how often you use it, the product’s potency and other factors all play a role. Some people feel calm or euphoric, while others experience anxiety, panic or even detachment from reality, especially with high-THC products.
“The higher the THC, the better the high will be.”
Not necessarily. A higher THC percentage doesn’t guarantee a better experience. More potent cannabis products can also mean stronger unwanted effects, like anxiety, panic or confusion. Everyone reacts differently based on personal factors, such as mental health and tolerance. Starting low and going slow is the safest way to have a more enjoyable experience.
“If you don’t feel the edible within an hour, take another one.”
Don’t rush it. Edibles take longer to kick in than smoking because your body must digest and process the THC first. For most people, that’s 30 minutes to two hours, and sometimes longer, depending on the product. Give yourself the full window before taking more — starting low (around 2.5 mg THC or less) and checking in after a couple of hours is the safest way to stay in control and have a comfortable experience.
Mixing substances
“There’s no risk in mixing weed and alcohol — it just makes the buzz better”
Mixing cannabis and alcohol isn’t risk-free. Alcohol can raise THC levels in your blood, making you feel far more intoxicated for longer. If you consume cannabis first (or vice versa), it can be hard to judge how impaired you are and make a thoughtful decision about consuming more. This is especially risky with edibles, which take longer to take effect and can make you underestimate your level of intoxication. Combining the two often leads to unpredictable effects and a higher chance of “greening out”, fainting or vomiting. The safest choice? Keep alcohol and cannabis separate.
“Cannabis is natural, so it won’t interact with my medication.”
Cannabis can interact with medications such as antidepressants, sedatives and blood pressure drugs, potentially causing harmful effects. Just because cannabis is natural doesn’t mean it’s safe to mix with other medications. If you’re taking prescription drugs or have health concerns, talk to a healthcare provider before consuming cannabis.
