Definition: This block contains a wide variety of disorders that differ in severity and clinical form but that are all attributable to the use of one or more psychoactive substances, which may or may not have been medically prescribed. The third character of the code identifies the substance involved, and the fourth character specifies the clinical state. The codes should be used, as required, for each substance specified, but it should be noted that not all fourth character codes are applicable to all substances. Identification of the psychoactive substance should be based on as many sources of information as possible. These include sel ...[+++]f-report data, analysis of blood and other body fluids, characteristic physical and psychological symptoms, clinical signs and behaviour, and other evidence such as a drug being in the patient's possession or reports from informed third parties. Many drug users take more than one type of psychoactive substance. The main diagnosis should be classified, whenever possible, according to the substance or class of substances that has caused or contributed most to the presenting clinical syndrome. Other diagnoses should be coded when other psychoactive substances have been taken in intoxicating amounts (common fourth character .0) or to the extent of causing harm (common fourth character .1), dependence (common fourth character .2) or other disorders (common fourth character .3-.9). Only in cases in which patterns of psychoactive substance-taking are chaotic and indiscriminate, or in which the contributions of different psychoactive substances are inextricably mixed, should the diagnosis of disorders resulting from multiple drug use (F19.-) be used. | Modifiers The following fourth-character subdivisions are for use with categories F10-F19: Code Title .0 Acute intoxication A condition that follows the administration of a psychoactive substance resulting in disturbances in level of consciousness, cognition, perception, affect or behaviour, o ...

Old posterior myocardial infarction

Old lateral myocardial infarction

Healed coronary

Old episode (qualifier value)

Consistent with Health Canada’s operational definitions of smoking status for the YSS, respondents were then grouped into the following eight categories: daily smoker (smoked at least 100 cigarettes and currently smokes cigarettes every day); occasional smoker (smoked at least 100 cigarettes and currently smokes cigarettes but not every day); former smoker (smoked at least 100 cigarettes but had not smoked in the last 30 days); experimental smoker (smoked in the last 30 days but had not smoked at least 100 cigarettes); past experimental smoker (had smoked a whole cigarette but had not smoked in the last 30 days and had not smoked at ...[+++]least 100 cigarettes); puffer (had tried smoking but has not smoked a whole cigarette) and never tried (never tried a cigarette, not even a few puffs).

Among lung cancer cases attributable to radon, 60% occur in smokers, 30% in former smokers and 10% in non-smokers.

We defined three smoking status categories: current daily smokers (those who smoked cigarettes daily at the time of the interview and who had smoked 100 cigarettes or more over their lifetime); former smokers (those who had smoked daily but quit or still smoked occasionally at the time of the interview) and non-smokers (those who had never smoked or had smoked fewer than 100 cigarettes in their lifetime).

Personal smoking habits and exposure to second-hand smoke have been linked to mental health in several studies.We found that both former and current smokers were significantly more likely to report moderate/high mental distress than non-smoking respondents, and that exposure to household smoking was significantly associated with increased risk of moderate/high mental distress (see Table 1).