Low-yield Cigarettes And Diminution Of Small Airways Lung Function In Long-term Smokers
Funder
National Health and Medical Research Council
Funding Amount
$209,500.00
Summary
The modern cigarette has been designed to produce low yields of tar when the tobacco in the cigarette is burnt. The tar contains human carcinogens, and monitoring and regulating yields of tar has long been part of the comprehensive tobacco control strategy in Australia. This focus on tar has given an implicit endorsement of the low-yield cigarette as a safer cigarette. Recently, however, controversy has emerged about whether smoking low-yield cigarettes has reduced the harm done by smoking. The ....The modern cigarette has been designed to produce low yields of tar when the tobacco in the cigarette is burnt. The tar contains human carcinogens, and monitoring and regulating yields of tar has long been part of the comprehensive tobacco control strategy in Australia. This focus on tar has given an implicit endorsement of the low-yield cigarette as a safer cigarette. Recently, however, controversy has emerged about whether smoking low-yield cigarettes has reduced the harm done by smoking. The concern is that adenocarcinoma of the lung, a type of lung cancer that is most common in the small peripheral airways, has increased in frequency. This could be because the low-yield cigarette, with reduced yields of nicotine as well as tar, is smoked more intensely by smokers to compensate for the low nicotine. By smoking more intensely, we mean taking larger and more frequent puffs, inhaling the smoke deeply into the lungs, and holding the breath before expiring. This method of smoking would result in more tar particles being deposited in the peripheries of the lung where adenocarcinoma is most common. Because cigarette smoking has been linked also with other structural changes in the small airways of the lung, resulting in obstruction of airflow, we will test whether smoking low-yield cigarettes is associated with greater obstruction of the small airways than is smoking higher-yield cigarettes. To test whether the mechanism is the method of smoking, we will carefully describe and quantify each subject's pattern of smoking including the deposition of smoke-like Technegas particles in the peripheral lung.Read moreRead less
Psychosocial Disorders Of Youth: A Population-based Prospective Study Into Young Adulthood
Funder
National Health and Medical Research Council
Funding Amount
$450,939.00
Summary
Much earlier work in adults has pointed to the teens as a common point at which many of the important causes of chronic disease and disability in adults begin. These include problems such as tobacco use, depression and anxiety disorders, obesity, alcohol abuse and illicit drug use. However, only a prospective study is able to clarify to what extent common health risk behaviours of teenagers pose a threat to later health and well-being and what characteristics indicate those most likely to go on ....Much earlier work in adults has pointed to the teens as a common point at which many of the important causes of chronic disease and disability in adults begin. These include problems such as tobacco use, depression and anxiety disorders, obesity, alcohol abuse and illicit drug use. However, only a prospective study is able to clarify to what extent common health risk behaviours of teenagers pose a threat to later health and well-being and what characteristics indicate those most likely to go on to problems such as nicotine dependence, recurrent depression and illicit drug abuse. The proposal deals with the follow-up ten years on of a representative sample of 2000 Victorian teenagers. Seven earlier waves of data collections have ascertained levels and risk factors for common behavioural and mental health problems in the teens and early twenties. These problems included depression and anxiety, smoking, heavy alcohol consumption, illicit drug use, deliberate self-harm, obesity, eating disorder, sexually risky behaviour, intravenous drug use, antisocial behaviours and accidental injury. This follow-up of participants at the age of 24 to 25 years will ascertain persisting rates of these problems including levels of substance dependence and mental disorder. Social outcomes such as educational achievement, employment, relationships, parenthood and friendships will be ascertained. In addition mouth washes will be used to collect DNA to allow investigation of genes that may make a contribution to more severe mental disorder and substance dependency. This study will give a clear picture of the outcome and consquences of common adolescent health problems. It will also clarify further psychosocial factors that contribute to their onset or outcome. Together with an analysis of candidate genes the study should make a great contribution to the information necessary for planning effective preventive intervention.Read moreRead less