Title: Substance use - marijuana: MedlinePlus Medical Encyclopedia
Headings: Substance use - marijuana
Substance use - marijuana
Marijuana's Effects on Your Brain
Harmful Effects of Marijuana
Marijuana can be Addictive
Treatment Options
Your Ongoing Recovery
Resources
When to Call the Doctor
Alternative Names
References

Content: Using marijuana may cause pleasurable effects such as: Feeling "high" (pleasant sensations) or very relaxed ( marijuana intoxication)
Having an increased appetite ("the munchies")
Increased sensations of sight, hearing, and taste
How fast you feel the effects of marijuana depends on how you use it: If you breathe in marijuana smoke (such as from a joint or pipe), you may feel the effects within seconds to several minutes. If you eat foods containing the drug as an ingredient, such as brownies, you may feel the effects within 30 to 60 minutes. Harmful Effects of Marijuana
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Marijuana can also have unpleasant effects: It can affect your mood -- You may have feelings of panic or anxiety. It can affect how your brain processes things around you -- You may have false beliefs (delusions), become very fearful or confused, see or hear things that are not there ( hallucinations ). It can cause your brain not to work as well -- For example, you may not be able to concentrate or pay attention at work or at school. Your memory may weaken. Your coordination may be affected such as with driving a car.