BACKGROUND Secondhand smoke, which is also referred to as environmental tobacco smoke and passive smoke, is a known human carcinogen. Secondhand smoke also causes disease and premature death in nonsmoking adults and children. METHODS We summarize studies of secondhand smoke in public places before and after smoking bans, as well as studies of cardiovascular and respiratory disease before and ...

Latin America is at the forefront of global progress in smoke free workplaces. Comprehensive smoke free laws have been implemented in four countries, and in many cities, states and provinces. More than 130 million people in Latin America are now protected from secondhand tobacco smoke. Nevertheless, a survey of tobacco control advocates and governments in Latin America found several challenges ...

INTRODUCTION The home can represent a significant source of secondhand smoke (SHS), especially for individuals who live in close proximity to one another in multiunit housing (MUH). The objective of this study was to quantify real-time SHS transfer between smoke-permitted and smoke-free living units within the same MUH structure. METHODS Air monitors were used to assess PM₂.₅, an environmenta...

Exposure to environmental tobacco smoke (ETS), which is largely composed of the sidestream cigarette smoke, has been implicated in increased incidence of cancer among nonsmokers. The present study was conducted to compare the potential of mainstream and sidestream cigarette smoke to induce DNA adducts in mice. Groups of female C57Bl and DBA mice were exposed twice daily for 65-70 weeks to mains...

OBJECTIVES To determine the effects of aging on the toxicity of sidestream tobacco smoke, the complex chemical mixture that enters the air from the lit end of burning cigarettes and constitutes the vast bulk of secondhand smoke. DESIGN Statistical analysis of data from controlled experimental exposures of Sprague Dawley rats to fresh and aged (for more than 30 minutes) sidestream smoke for up...

The present study demonstrates the existence of tissue transglutaminase in rabbit alveolar macrophages and measures the effects of cigarette smoke extracts on the activity of enzyme partially purified from these cells. The effects of smoke on transglutaminase purified from guinea pig liver are also measured. A water soluble component of gas-phase cigarette smoke inhibits both enzymes in a dose-...

Male strain A/J mice were exposed for six hours a day, five days a week for six months to either full tobacco smoke or to tobacco smoke drawn through a HEPA filter that removed more than 99% of particulate matter. After another four months in air, the animals were sacrificed and lung tumors were counted for calculation of multiplicities and incidences. Analysis of the chamber atmospheres showed...

INTRODUCTION Smoke-free policies can effectively protect nonsmokers from secondhand smoke (SHS) exposure in multiunit housing. We surveyed all affordable multiunit housing properties in North Carolina to determine the statewide prevalence of smoke-free policies and to identify predictors of smoke-free policies. METHODS Representatives of affordable housing properties in North Carolina complet...

OBJECTIVE The objective of this study was to examine the separate and combined effects of tobacco and biomass smoke exposure on pulmonary histopathology in rats. INTRODUCTION In addition to smoking, indoor pollution in developing countries contributes to the development of respiratory diseases. METHODS Twenty-eight adult rats were divided into four groups as follows: control group (Group I,...

This paper presents a combined approach for rapid smoke detection from video sequences using pre-improvement methods. Smoke is characterized by different properties like a color, irregularities in motion, smoothing the edges, etc. There are hard to describe it using basic image features. Usually smoke detection algorithms use some color and turbulence features for the smoke description. But our...