Detrimental Impact on Education: Marijuana use interferes with “memory, problem-solving, and learning.” Even occasional marijuana use has been found to lower IQ by as much as eight points, according to the National Academies of Science.
Coronary and Respiratory Problems: The heart rate of a marijuana user increases by up to 100 percent for roughly three hours after smoking marijuana. Harvard researchers report that the risk of heart attack in the hour after smoking is five times higher than normal. According to a 40-year study conducted by the Northern Medical Program, marijuana use more than doubles the risk of developing lung cancer.
Mental Health Problems: Daily marijuana use increases the risk of depression and anxiety four-fold, according to the British Medical Journal. In a study of youth, the Office of National Drug Control Policy recently reported that those who used marijuana weekly were four times more likely than non-users to engage in violent behavior.
Addiction Rates: As many as 50 percent of the people who smoke marijuana daily will become addicted according to a U.S. Substance Abuse and Mental Health Services Administration study released in 2015.
Infant Use: From 2006-2013, the rate of marijuana consumption among children under age six increased 610 percent in states where medical marijuana was legalized. This resulted in severe symptoms such as seizures, respiratory problems, and comas, according to researchers at Nationwide Children’s Hospital.
Birth Defects: Increasing marijuana use by pregnant women is resulting in higher rates of birth defects, including premature birth, stillbirth, low birthweights, heart defects, Neonatal Abstinence Syndrome (addicted newborns going through withdrawal), and miscarriages, according to the Alcohol & Drug Abuse Institute.The medical journal Cancer reported that babies exposed to marijuana in utero have a 110-percent increase of contracting nonlymphoblastic leukemia.
Vehicle Accidents: A 2014 review of 20 years of marijuana research found that driving after smoking marijuana doubles the risk of having a vehicle crash according to research published in the medical journal Addiction and the National Institutes of Health.
Workplace Safety and Other Detrimental Workplace Impacts: The National Institute on Drug Abuse stated in 2014 that employees who test positive for marijuana have 55 percent more industrial accidents, 75 percent higher absenteeism rates, and 85 percent more injuries than those employees who test negative on a preemployment drug test.