introduction: tobacco smoke is involved in the pathogenesis of several diseases in different body systems. saliva is the first body fluid that confront inhaled cigarette smoke which is injurious to the oral cavity and is associated with several oral diseases and cancer. the aim of our study was to evaluate the influence of smoking on the activity of alpha-amylase in the saliva of healthy smoker...

It has been shown, that smoking results in a lower yield of surfactant associated phospholipids in bronchoalveolar lavage (BAL). Indirect evidence suggests impaired secretion. In the present study, we investigated the influence of cigarette smoke on surfactant secretion in cultured rat alveolar type II cells. Smoke exposure was achieved by bubbling the smoke of four cigarettes through Dulbecco'...

BACKGROUND Prevalence of passive smoke exposure is relatively unknown in chronic rhinosinusitis (CRS). Previous studies have attempted to establish this relationship using subjective, questionnaire-based methodologies to assess smoke exposure, thus introducing the potential for error bias. The purpose of this study was to accurately determine the prevalence of passive smoke exposure in CRS and ...

Objective: This study set out to investigate the relationship between molecular-genetic mechanisms that modulate cytokine in infants whose parents expose them to cigarette smoke and those that do not expose their infants to cigarette smoke with the possible effects on the severity of pneumonia at presentation to hospital. Methods: This cross sectional study recruited infants and parents from a ...

BACKGROUND Cigarette smoke has both pro-inflammatory and immunosuppressive effects. Both active and passive cigarette smoke exposure are linked to an increased incidence and severity of respiratory virus infections, but underlying mechanisms are not well defined. We hypothesized, based on prior gene expression profiling studies, that upregulation of pro-inflammatory mediators by short term smok...

It is very challenging to accurately detect smoke from images because of large variances of smoke colour, textures, shapes and occlusions. To improve performance, the authors combine dual threshold AdaBoost with staircase searching technique to propose and implement an image smoke detection method. First, extended Haar-like features and statistical features are efficiently extracted from integr...

A mathematical model has been developed to investigate the effect of a sprinkler spray on adjacent horizontal smoke venting and in particular the water droplet drag component. The pressure difference across a roof vent and the volumetric flow of smoke vented are determined by considering the interaction between the drag force of the sprinkler spray and the buoyancy of the smoke layer in the spr...

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...