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Short-Term Effects. The main active chemical in marijuana is THC (delta​tetrahydrocannabinol). When someone smokes marijuana, THC goes from the lungs.

Self-Medicating and Escape Many teens turn to marijuana in an effort to self-​medicate, to make themselves feel better. They use marijuana to try. Teenage marijuana use is at its highest level in 30 years, and today's teens are more likely to use marijuana than tobacco. Many states allow recreational use of.