Introduction
Marijuana is one of the most controversial drugs around. Because it comes from a plant, it is often called weed, grass, or pot. Research has shown that marijuana has many negative effects on the body. On the Web site below you will read about marijuana and how it negatively affects the brain, heart, lungs, and immune system.
Link to explore: Mind Over Matter: http://www.nida.nih.gov/mom/mj/mommj1.html
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