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When smokers are stratified by smoking intensity, there was no dose-response relationship between smoking and body weight. This study explained the relationship between dietary intake, body weight and body mass
index in adult smokers. Over the years it has been supported by many findings that smokers tend to weigh less, have a lower body mass index (BMI) and are leaner than non smokers. An analytical review of relationship
between smoking and nutrient intake demonstrated that smoker had high fat along with alcohol consumption and lower intakes of fruits and vegetables. This study was conducted to review the relationship of smoking with
low BMI and under nourished weight of the adult smokers. The mechanism of smoking decreases body weight which is mediated by nicotine. Smoking a cigarette serve as a behavioural alternative to eating, resulting in
decreased food intake. Body weight is determined by balance of calorie intake and daily energy expenditure (metabolic rate +physical activity + thermic effects of food). Nicotine acts as a sympathomimetic drug which
increase energy expenditure suppressing food intake and increasing metabolic rate during work output than at rest. It was found out that the diet of respondents included high intakes of protein and fats but was lower in
energy and carbohydrates. The additional protein contributed to energy requirements and additional fats contributed little to weight management.