Understanding the danger of drugs
Contaminants in marijuana:
Cancer patient dies--medical pot cause
Heavy metals, fungus in marijuana
Health and Medicine
Dangers of Marijuana Experienced First Hand
Dangers of Teen Cannabis Use
Dangers of Indoor Marijuana Grows
Marijuana Not Benign
Proof cannabis DOES lead teenagers harder drugs
Marijuana and Teens: Risky Business
The Health and Social Effects of Non-Medical Cannabis
80% marijuana tests positive for pathogen
Southern California counties tested positive for pesticides.
The Other Side of Cannabis Documentary
We have strong evidence that marijuana use may lead to:
• Breathing problems, including inflammation of the airways and symptoms of chronic bronchitis, such as daily cough and phlegm.
• Short-term declines in memory, attention, and learning.
• Increased risk of poisoning among children.
• Increased risk for low birth weight in babies when a mother uses during her pregnancy[PDF 229KB].
• Increased risk for psychosis or schizophrenia.
Learn about the health effects of marijuana.
There is evidence that marijuana use may also lead to:
• Increased risk for some types of cancer.
• Increased risk for heart attack and stroke.
• Decreased IQ—and this change in IQ can last a long time and may even be permanent.
• Less academic and career success[PDF 224KB].
• Lower income[PDF 224KB].
• Poor school performance[PDF 224KB].
• Increased risk for motor vehicle crashes[PDF 213KB].
Scientific evidence of harms of marijuana