You might use more than intended, fail to cut back, or feel strong cravings. Missing duties or using despite issues are also common signs.[1] These issues suggest talking to a qualified professional. Yet, they do not serve as a diagnosis for you or others.
For broader context, see our guide to general signs of drug addiction before focusing on cannabis-specific signs.
We operate a U.S. treatment directory and are not a care provider. This guide provides information only. It does not take the place of professional advice.
Marijuana Use That Causes Worry
Population data tells us how common cannabis use disorder is. However, it cannot diagnose you or a loved one. A qualified clinician must make that call.
Knowing how common this is can help. If you worry about your use or someone else's, it may make you feel less alone.
Estimates vary. They depend on who was surveyed, and how questions were asked. Certain studies focus solely on those who use cannabis. Others look at the general population. Do not combine figures from different sources due to these gaps.
Here are three main numbers from reliable U.S. sources:
About 1 in 6
people who begin using cannabis as teens may develop cannabis use disorder[2]
4 to 7 times
higher risk of developing cannabis use disorder for people who start using before age 18, compared to those who start as adults[2]
1 in 6
Americans older than age 12 reported experiencing a substance use disorder in the past year (2023 survey)[3]
Substance use disorders affect people of all ages, as these numbers show. Get professional guidance if you see signs of struggle in yourself or others.
Indicators of Cannabis Use Disorder
Doctors use the term cannabis use disorder for a problematic pattern. It happens when marijuana use creates distress or issues in daily life. These indicators reflect a pattern over time, not a single bad week or event. Clinicians use these criteria to see if use has become harmful.
Every sign reveals how your life may be affected by use.
| Sign | What it looks like |
|---|---|
| Using more or longer than planned | You plan to smoke for an hour but use all day. Or you use more than you meant to. |
| Trying to cut down but failing | You aim to cut back or quit, yet you find it difficult to maintain. |
| Spending lots of time on marijuana | You spend your time getting high, using, or coming down from the effects. |
| Strong urges or cravings | Using crosses your mind frequently. You feel intense cravings, even when you do not want to use. |
| Not meeting duties at work, school, or home | Using makes your grades fall, you miss work shifts, or chores stack up. |
| Continued use despite relationship problems | You keep using despite causing fights with friends, family, or partners. |
| Giving up important activities | You quit hobbies, sports, or social plans you once enjoyed because of using. |
| Using in risky situations | You drive high, use near children, or mix marijuana with other risky behaviors. |
| Continuing despite physical or mental issues | You keep using even if it worsens anxiety, causes coughing fits, or brings on panic attacks. |
| Tolerance: needing more for the same effect | Small amounts do not work like before. So you need bigger doses to get the same effect. |
| Withdrawal symptoms when stopping | When you stop using, you feel irritable, anxious, restless, have trouble sleeping, lose your appetite, or feel sick. |
To meet the diagnostic threshold for cannabis use disorder, someone needs 2 or more of these signs in a 12-month period.[4] This list is for education only. It is not a tool for self-diagnosis. A qualified professional is the only one who can check if these signs point to cannabis use disorder and help plan next steps.
Shifts Other People Might Spot
No single look or action proves someone uses marijuana or has a substance use disorder. How people act and look varies widely, and many changes have other causes. If you are wondering how can you tell if someone is using marijuana, focus on specific shifts in routines, responsibilities, relationships, or interests rather than stereotypes.
Intoxication can affect perception and motor skills, short-term memory, and mood, sometimes causing panic or paranoia.[5] These effects may be more noticeable in new users or people with existing mental health conditions.[5] However, seeing these signs does not confirm addiction. Many factors, such as stress, sleep loss, or other substances, can look similar.
If someone is in immediate danger, has severe confusion, hallucinations, or cannot stay safe, call 911 or go to the nearest emergency room now. If they have thoughts of suicide or self-harm, call 911 or go to the nearest emergency room now, or call or text 988.
Observations to Guide a Conversation
Your ticks are saved on this device only.
Use what you notice to start a talk, not as proof or a diagnosis. See our guide on suspecting a loved one uses drugs for wider tips on handling this subject.
Effects of Using Marijuana Over Time
Curiosity about the side effects of long-term use of marijuana is common. Your health history, the product's strength, and how often you use it all play a role. Using cannabis does not mean you will face serious health issues. However, some patterns can raise risks.
Potency is one key factor. THC levels in cannabis products have risen in recent decades.[6] How often you use, how much, and THC strength show different parts of use. Using a strong product does not ensure a specific result.
Studies often examine groups rather than single people. So if research finds a link, it cannot predict your exact outcome. Below is a breakdown of common concerns and how to interpret them carefully.
| Concern | What research suggests | What readers should not conclude |
|---|---|---|
| Frequent use | There is no single amount that defines “heavy use” or, by itself, diagnoses cannabis use disorder; the DSM-5-TR threshold is at least two criteria within 12 months.[4] Daily or near-daily use describes frequency, which is distinct from the amount used and THC potency. | That frequency alone establishes cannabis use disorder. |
| Higher-THC products | The THC concentration in cannabis products has gone up over recent decades.[6] | Higher THC concentration ensures a specific result. |
| Mental health concerns | Use during adolescence and young adulthood may affect brain development and lead to learning problems in school.[7] | That marijuana causes every mental health struggle, or that all people see the same result after stopping. |
| Smoking cannabis | Smoking can irritate the airways, leading to sore throat, narrowing, spasms, or infections like bronchitis in heavy users.[7] | Smoking is the only way to use cannabis, or every lung issue is permanent. |
The evidence here notes that teen and young adult cannabis use may affect brain growth and learning. It does not show if or how much a person gets better after stopping, or how long that may take.[7]
It helps to separate what is known for groups from what might happen to you. Smoking cannabis can irritate the airways, causing a sore throat and narrowing or spasms.[7] Other methods are not risk-free. Cannabis can also cause impaired perception and motor skills, short-term memory problems, panic, or paranoia.[5] This info does not suggest using cannabis or changing how you use it.
Talk with a doctor if you worry about your memory, mood or breathing. They check your whole health picture, not just cannabis use. Only a professional can help you see if your symptoms relate to marijuana, another condition, or both.
Marijuana Withdrawal Symptoms and Their Differences
You experience withdrawal when you stop or cut down on a substance. Physical or psychological symptoms occur as your body reacts.[1]
With marijuana, common withdrawal signs include anxiety, agitation, and trouble sleeping.[7] Agitation means you feel tense, confused, or irritable.
These symptoms do not automatically prove you have cannabis use disorder. Diagnosis checks a wider pattern of behavior. This includes using despite problems or ignoring responsibilities. Still, withdrawal can be uncomfortable. It may make it hard to quit alone.
Each person’s experience varies. These timings are common but not guaranteed. Do not manage severe withdrawal alone at home without professional guidance. A healthcare provider can help you make a safe plan to stop using.
If you or someone else experiences severe confusion, hallucinations, or thoughts of suicide or self-harm, call 911 or go to the nearest emergency room now. If you are struggling with suicidal thoughts, you can also call or text 988 for support. Read our guide on when withdrawal needs emergency care to learn about recognizing serious risks.
What to Do If a Teen or Young Adult Uses
It can be worrying to see changes in your teen. Look at the whole picture rather than one act alone. A young person's brain is still growing. Marijuana use in the teen or young adult years may affect brain development.[7] It can also cause learning problems in school.
The table shows common shifts and helpful responses. It is not a diagnosis or a test. Use it to help open a dialogue.
| Area | Change you might notice | Supportive next step |
|---|---|---|
| School | Skipping class, missing assignments, or lower grades | Talk about hard subjects or stress without placing blame |
| Relationships | Joining new groups or leaving old friends behind | Hear them describe their friends without criticizing |
| Daily responsibilities | No longer caring about hobbies, sports, or chores | Check on their mood and sleep, and offer help with routines |
Try to stay calm when you share your worries. A soft conversation often works better than giving an ultimatum. Speak with a doctor if you fear for their health. The American Academy of Pediatrics suggests using Screening, Brief Intervention, and Referral to Treatment (SBIRT) more for teens.[8] Doctors are urged to ask about substance use early. They can link teens to help if it is needed.
Each young person is unique. The reasons they use marijuana may differ from those of adults. So might their needs for support. Trust your gut, but first try to see what they are facing.
Addressing Worries and Seeking Support
It can be hard to talk about marijuana use. Being gentle makes it easier. Share specific behaviors you noticed. Do not label the person. This lowers their defensiveness. It also invites honest talk.
- Identify the specific concern. Think of concrete examples, like missing work or mood changes.
- Choose a calm, private time to talk. Do not bring it up if they are intoxicated or stressed.
- Ask what support the person wants. Listen without judgment. Ask open questions, like, "How are you feeling about your recent use?"
- Offer help connecting with a qualified professional or U.S. support resource. You could offer to call the SAMHSA National Helpline with them. It gives free, confidential referrals and info about mental and/or substance use disorders 24 hours a day.[9]
If you worry about a teen, urge them to talk to a trusted adult or health professional. Never guess what their confidentiality rights are. Ask a professional to explain minor privacy rules where you live. Read our guide on how to help someone with addiction for tips on helping a loved one.
Next Steps Check-In
This self-check is for information only and isn't a diagnosis.
Once you are ready to look further, use search for treatment near you to find programs for cannabis use concerns. Check check your insurance coverage before booking to know what costs may apply.
Frequently Asked Questions
What can someone experience during marijuana intoxication?
Cannabis intoxication can impair perception and short-term memory and may cause panic or paranoia.[5] If someone has severe confusion or hallucinations, call 911 or go to the nearest emergency room now. If someone has thoughts of suicide or self-harm, call 911 or go to the nearest emergency room now; for suicidal thoughts, also call or text 988.[10]
How can you tell if someone is using marijuana?
Red eyes and dry mouth can be short-term signs.[5] These alone do not prove cannabis use or cannabis use disorder. Watch for specific behavior changes. Ask a respectful question rather than accusing them.
How can you tell if someone is on drugs?
One behavior or look does not prove drug use. Appearance and behavior changes have many causes. Focus on the specific changes you see. Approach the person without accusing them.
What is considered heavy daily use of marijuana?
Using cannabis every day does not by itself mean you have cannabis use disorder. The DSM-5-TR threshold is at least two criteria within a 12-month period.[4] A professional can help assess your concerns.
Can your brain recover after years of marijuana use?
Using marijuana as a teen or young adult may affect brain development. It can lead to learning problems in school.[7] If you are worried about memory, attention, or learning, talk to a professional.
How are marijuana withdrawal symptoms different from signs of addiction?
Withdrawal involves physical or mental symptoms when you cut back or stop using.[1] Ask a professional about worrying symptoms rather than guessing the cause yourself.
How do I know if I or someone else is addicted to marijuana?
The DSM-5-TR labels cannabis use disorder as mild (2–3 criteria), moderate (4–5), or severe (6+).[4] These categories are not a self-test.
