Drugs can prohibit dangerous behavior, and often result in actions consumers can't remember and/or have no control over. Such as vandalism, injury, threatening other victims, and even death. Making such drugs can be dangerous, as people may add or slip things into the drug of choice.
Answer:
The immune response is how your body recognizes and defends itself against bacteria, viruses, and substances that appear foreign and harmful.
Information
The immune system protects the body from possibly harmful substances by recognizing and responding to antigens. Antigens are substances (usually proteins) on the surface of cells, viruses, fungi, or bacteria. Nonliving substances such as toxins, chemicals, drugs, and foreign particles (such as a splinter) can also be antigens. The immune system recognizes and destroys, or tries to destroy, substances that contain antigens.
Your body's cells have proteins that are antigens. These include a group of antigens called HLA antigens. Your immune system learns to see these antigens as normal and usually does not react against them.
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Some people take up negative coping methods such as consuming too much caffeine. People with high stress often use it to jump start there energy, and make them more productive, which can lead to a caffeine addiction. Others smoke, or drink in excess which again turns into a drug habit into addiction. Some people compulsively spend money thinking material things will relieve their stress. Finally, one of the most common negative responses to stress would be emotional eating, which can lead to obesity and other health problems.
Hope that helped.