there is an additional connotation to the term habituation which applies to psychological dependency on drugs, and is included in several online dictionaries. a team of specialist from the world health organization assembled in 1957 to address the problem of drug addiction and adopted the term "drug habituation" to distinguish some drug-use behaviors from drug addiction. according to the who lexicon of alcohol and drug terms, habituation is defined as "becoming accustomed to any behavior or condition, including psychoactive substance use". by 1964 the america surgeon's general report on smoking and health included four features that characterize drug habituation according to who: 1) "a desire (but not a compulsion) to continue taking the drug for the sense of improved well-being which it engenders"; 2) "little or no tendency to increase the dose"; 3) "some degree of psychic dependence on the effect of the drug, but absence of physical dependence and hence of an abstinence syndrome"; 4) "detrimental effects, if any, primarily on the individual". however, also in 1964, a committee from the world health organization once again convened and decided the definitions of drug habituation and drug addiction were insufficient, replacing the two terms with "drug dependence". substance dependence is the preferred term today when describing drug-related disorders, whereas the use of the term drug habituation has declined substantially. this is not to be confused with true habituation to drugs, wherein repeated doses have an increasingly diminished effect, as is often seen in addicts or persons taking painkillers frequently.