Marijuana has some well-proven benefits, including providing relief for long-term after pain symptoms. But smoking marijuana can have some bad effects on your health, including making breathing problems worse.
Marijuana comes from the dried flowers of cannabis plants. It has more than 500 chemicals. Cannabis can have a psychoactive or mind-altering effect on you.
This is the main psychoactive agent in marijuana. Its full name is delta 9-tetrahydrocannabinol. When you smoke cannabis, THC goes from your lungs into your bloodstream and then into your brain. It stimulates the part of your brain that responds to sources of pleasure, like food and sex. That lets loose a chemical called dopamine, which causes the high.