Which of the Following Statements About Marijuana Is FALSE

Which of the following statements about marijuana is FALSE?

A) It has been shown that regular use leads to both psychological and physiological dependence.
B) Its use increases heart rate and is linked to later use of harder drugs.
C) More than 40 percent of adult Americans report having used marijuana at some point in their lives.
D) It introduces cancer-causing substances into the body and increases risk of respiratory diseases.
E) Its use has a definable withdrawal syndrome among long-term heavy users who abruptly stop using it.