THE HARMFUL EFFECTS OF MARIJUANA

The immediate effects of taking marijuana include rapid heart beat, disorientation, lack of physical coordination, often followed by depression or sleepiness. Some users suffer panic attacks or anxiety.

But the problem does not end there. According to scientific studies, the active ingredient in cannabis, THC, remains in the body for weeks or longer.

Marijuana smoke contains 50% to 70% more cancer-causing substances than tobacco smoke. One major research study reported that a single cannabis joint could cause as much damage to the lungs as up to five regular cigarettes smoked one after another. Long-time joint smokers often suffer from bronchitis, an inflammation of the respiratory tract.

The drug can affect more than your physical health. Studies in Australia in 2008 linked years of heavy marijuana use to brain abnormalities. This is backed up by earlier research on the long-term effects of marijuana, which indicate changes in the brain similar to those caused by long-term abuse of other major drugs. And a number of studies have shown a connection between continued marijuana use and psychosis.


Marijuana changes the structure of sperm cells, deforming them. Thus even small amounts of marijuana can cause temporary sterility in men. Marijuana use can upset a woman’s menstrual cycle.

Studies show that the mental functions of people who have smoked a lot of marijuana tend to be diminished. The THC in cannabis disrupts nerve cells in the brain affecting memory.

Cannabis is one of the few drugs which causes abnormal cell division which leads to severe hereditary defects. A pregnant woman who regularly smokes marijuana or hashish may give birth prematurely to an undersized, underweight baby. Over the last ten years, many children of marijuana users have been born with reduced initiative and lessened abilities to concentrate and pursue life goals. Studies also suggest that prenatal (before birth) use of the drug may result in birth defects, mental abnormalities and increased risk of leukemia1 in children.

How marijuana affects the body

Marijuana smoke can cause many of the same respiratory problems experienced by tobacco smokers, such as increased daily cough and phlegm production, more frequent acute chest illnesses such as bronchitis, and a greater instance of lung infections, according to NIDA.

While it had been thought that there was a connection between marijuana smoking and increased risk of lung cancer, even those who are heavy marijuana users do not appear to be at greater risk for lung cancer, according to a 2013 study by Dr. Donald Tashkin, UCLA professor of pulmonary and critical care medicine.

Marijuana can also raise heart rate by 20 percent to 100 percent shortly after smoking and the effect can last up to three hours, according to NIDA.

While it is widely thought that marijuana is not addictive, about 9 percent of users become addicted to marijuana. Long-term marijuana users who try to quit experience cravings, irritability, sleeplessness, decreased appetite and anxiety — some of the same physical symptoms of those trying to quit other types of drugs or alcohol.


Several studies indicate that heavy marijuana use can lower the ability to fight infection and have an adverse impact on the immune system. Marijuana also can reduce sperm production in men and disrupts a woman’s menstrual cycle, according to NIDA.