Marijuana/Cannabis used for medical purposes is recommended to have less than 10% THC? true or false

Can someone give me one specific health problem, and explain it. !

Does anyone have an answer to this question? if so me.

How is health different for most people in this country today from what it was for people born in 1900? a. people have a shorter life span. b. people today work harder to survive. c. people today live in poorer sanitary conditions. d. people today can focus less on day-to-day survival and more quality of life.