True or false 1. your respiratory system is the system in your body that is responsible for breathing 2. the lungs are made up of thick fibrous tissue 3. internal respiration takes place in the alveori 4. the alveori are located at the end of the bronchi 5. the hemoglobin in blood combines with oxygen concentration is high 6. marijuana does not contain carcinogens 7. it is more difficult to stop smoking cigarettes if you use marijuana regularly 8. it takes as long as 3 days for the body to eliminate the chemical effect that marijuana has on the body 9. the drug thc acts as a stimulant and can improve strength, balance and coordination 10. people who quit smoking usually cannot reverse the adverse caused by cigarettes