Background: Nicotine-containing vaporized liquids—composed of propylene glycol, glycerin, water, flavorings, and the thickening agent vitamin E acetate—have been implicated in the development of EVALI. Under conditions of low liquid levels and overheating, these substances release toxic carbonyl compounds (e.g., formaldehyde, acetaldehyde, acrolein). In a 2019 national survey, 3.5% of adolescents aged 13–15 reported cigarette use, and 10% used e-cigarettes. Aim: To study the changes in the behavior, lung, and hippocampal structures of rats due to the effects of electronic cigarettes and their vapor. Materials and Methods: In this study, nineteen 14-day-old SHR rats were exposed to 1 g/mg/day of nicotine and dry hit vapor (control, nicotine and dry hit groups) for four weeks. Behavioral assessments (Open Field Test, Elevated Plus Maze, Conditioned Place Preference), bronchoalveolar lavage (BAL), and histological analysis of lung and hippocampal tissue were conducted. Results: The dry hit vapor group showed significantly reduced body weight (p=0.034), increased anxiety (p=0.006, p=0.025), and avoidance of the smoky chamber. BAL revealed elevated total cells, neutrophils, and macrophages (p=0.01, p=0.04) in both nicotine and dry hit groups. Lung tissue exhibited alveolar septal thickening, inflammation, and emphysema- like changes. Extensive neuronal death was observed in the hippocampus. Conclusion Anxiety-like behavior was observed in both the burn and control groups. Analysis of BAL in the dry hit group revealed inflammation predominantly characterized by macrophage infiltration. Histological examination of lung tissue from both experimental groups demonstrated a reduction in the number of alveoli, accompanied by acute inflammation and thickening of the interalveolar septa. In the hippocampal region, neuronal loss and a reduction in neuronal density were also observed.

Introduction: Factors such as social and economic conditions, technological development, modern urbanization, lifestyle, physical activity, nutrition, and air pollution affect physical growth and development. Aim: To study the physical development of Mongolian children. Objectives: 1. To measure the physical indices (weight, height) of children aged 6-17 years old with some influencing factors. Material and method: Using a random sampling method, children's body height and weight were examined at a particular point in time using widely accepted methods. Statistical analysis was performed using the "SPSS ver.25" program. Result: The growth of children's height and weight is progressing according to general patterns of age and gender. Girls grow rapidly between the ages of 10-13 and stabilize after wards, while boys a sharp growth spurt between the ages of 13-17, with the average height of 17-year-old boys being 171.44 cm and 160.25 cm for girls, which is slightly higher than previous studies (Otgon G, 2006, Munkhzaya M, 2020). The trend of weight growth is more prominent in boys. However, compared to international standards (Russia, WHO, CDC), our children's height and weight are lower. The statistics show that parental education, income, exercise, and living environment positively influence growth and development, whereas excessive television watching and air pollution negatively affect it (p< 0.05). Conclusion 1. Children's growth is normal, but observed increase of the body weight of boys. Having healthy and well educated parents, as well as engaging in physical activity positively influences children's height. A lack of physical activity negatively affects height and increases weight. Mongolian children are shorter and lighter compared to foreign children (from Russia and America - CDC).