The short-term side effects of marijuana include: problems with memory and learning;distorted perception (sights, sounds, time, touch); trouble with thinking and problem-solving;loss of coordination; and increased heart rate, anxiety.
These effects are even greater when other drugs are mixed with the marijuana; and users do not always know what drugs are given to them.

The long-term side effects from findings show that regular use of marijuana or THC may play a role in some kinds of cancer and in problems with the respiratory, and immune systems.

Lungs and airways People who smoke marijuana often develop the same kinds of breathing problems that cigarette smokers have: coughing and wheezing. They tend to have more chest colds than nonusers. They are also at greater risk of getting lung infections like pneumonia.

Immune system Animal studies have found that THC can damage the cells and tissues in the body that help protect people from disease. When the immune cells are weakened, you are more likely to get sick