The opiates are drugs that cause addition Heroin and cocaine are among the most famous example. The chemistry of the brain adapts to the presence of the opiate in such a way that the person taking the drug feels an uncontrollable need to take more of it. Owing to their ability to induce an artificial feeling of well being, the person taking heroin (or) cocaine quickly becomes addicted to them once this happens the craving for the drug often causes the person.

(i) Neglect ordinary rules of hygiene
(ii) Enter into a life of crime
As a result of drug addict becomes thin and susceptible illness.