Final answer:
THC is more abundant in marijuana smoke compared to tobacco smoke.
Step-by-step explanation:
Tobacco smoke contains dozens of carcinogens, including nicotine and formaldehyde. These chemicals increase the risk of cancer of the lung, mouth, throat, and other organs. On the other hand, marijuana smoke contains THC (delta-9-tetrahydrocannabinol), which is the psychoactive compound responsible for its effects. Therefore, the more abundant dangerous component in marijuana smoke compared to tobacco smoke is THC.