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Marijuana use carries significant risks to brain, heart, lung, and mental health, and can lead to addiction, impaired driving, and negative effects on daily life, especially in youth and pregnant women.
Addiction and Cannabis Use Disorder
Marijuana can be addictive. About
1 in 10 adults who use marijuana may develop a cannabis use disorder, and this risk rises to
1 in 6 for those who start before age 18. Signs include difficulty quitting, neglecting responsibilities, and prioritizing marijuana over social or family activities. High-THC products increase the likelihood of severe addiction symptoms
Centers for Disease Control and Prevention+2.
Brain and Cognitive Effects
Marijuana affects brain regions responsible for
memory, learning, attention, decision-making, coordination, and reaction time. Youth who use marijuana may experience
permanent IQ loss of up to 8 points, which does not recover even after quitting. Frequent use can impair problem-solving, memory, and cognitive function
Centers for Disease Control and Prevention+2.
Mental Health Risks
Marijuana use is linked to
depression, anxiety, psychotic episodes, and suicidal thoughts, particularly in individuals predisposed to mental health conditions. High-THC cannabis increases the risk of
schizophrenia and other psychoses in teens and young adults
Centers for Disease Control and Prevention+2.
Physical Health Risks
- Heart: Marijuana can raise heart rate and blood pressure, increasing the risk of stroke, heart disease, and vascular problems
Centers for Disease Control and Prevention+1.
- Lungs: Smoking marijuana can damage lung tissue, cause scarring, and harm small blood vessels
Centers for Disease Control and Prevention.
- Pregnancy: Use during pregnancy may lead to fetal growth restriction, premature birth, stillbirth, and impaired brain development, with THC passing through breast milk
SAMHSA+1.
Impaired Driving and Coordination
Marijuana impairs
reaction time, coordination, and judgment, making driving dangerous. Users may experience lane weaving, slower responses, and difficulty reacting to signals
Centers for Disease Control and Prevention+1.
Social and Daily Life Impacts
Regular marijuana use can negatively affect
relationships, educational outcomes, career achievement, and overall life satisfaction. It may reduce motivation and performance in daily activities
SAMHSA.
Summary
While marijuana is increasingly perceived as low-risk, it carries
substantial dangers, particularly for
youth, pregnant women, and frequent users. Risks include
addiction, cognitive impairment, mental health disorders, cardiovascular and lung issues, impaired driving, and negative social outcomes. Awareness of these risks is crucial for informed decision-making and harm reduction
Centers for Disease Control and Prevention+2.