The main active chemical in marijuana is THC (delta-9-tetrahydrocannabinol). Read More ›
Usually smoked as:
Some users also mix marijuana into foods or use it to brew tea.
Effects of Marijuana on the Brain
Researchers have found that THC changes the way in which sensory information gets into and is acted on by the hippocampus. This is a component of the brain's limbic system that is crucial for learning, memory, and the integration of sensory experiences with emotions and motivations.
Effects on the Lungs
Someone who smokes marijuana regularly may have many of the same respiratory problems that tobacco smokers have. Continuing to smoke marijuana can lead to abnormal functioning of lung tissue injured or destroyed by marijuana smoke.
The amount of tar inhaled by marijuana smokers and the level of carbon monoxide absorbed are three to five times greater than among tobacco smokers.
Source: The National Youth Anti-Drug Media Campaign