na, it has been lost in the haze that marijuana is a psychoactive drug. A drug that can lead to serious health problems, in some people. Most vulnerable are adolescents, young adults, and pregnant women, but heavy or chronic use of Weed can also lead to dependence and health complications for people at all ages. The scientific evidence clearly shows effects of Cannabis and Cannabis products on Cognition, Memory, and IQ as well as influencing Psychosis, Anxiety, Depression, Cardiovascular problems, and other health and behavioral problems. This book leads you directly to the science of Marijuana and the deleterious effects on your health.