There are three main factors that control the risks of becoming dependent on drugs. These factors are the type of drug, the personality of the individual, and the circumstances in which the drug is taken.
Indeed, it could be said that majority of the adult population have taken alcohol, yet few have become dependent on it. Also, many strong drugs that have been used for medical purposes have not caused the patient to become addicted.
However, it can be demonstrated that people who have taken drugs for fun are more likely to become dependent on the drug. The dependent is not always physiological but may remain psychological, although the effects are still essentially the same. Those at greatest risk appear to be personalities that are psychopathic, immature, or otherwise unstable.
Psychological dependence is very strong with heroin, morphine, cocaine, and amphetamines. Psychological dependence is great with heroin and amphetamine, but less with amphetamines, barbiturates, and alcohol.
Which of the following conclusions can be drawn from the text?
(A) One cannot become addicted to certain drugs if one has a strong personality.
(B) Taking drugs for "kicks" increases the possibility of becoming dependent on drugs.
(C) Psychological dependence is greatest with heroin.
(D) Alcohol is a safe drug since very few people become dependent on it.
(E) Long-term use of certain drugs for medical purposes does not cause addition.