Research Article

Nowadays the issue of street children is one of the most important issues of societies from industrial city to developing cities. There are approximately one hundred million children spending their life in streets. With regard to the last description of the International Organizations for street children, many of statistical result and numbers are reported less than the actual facts. many countries are suffering from an individual relation the issue of street children despite possessing common properties, and by controlling this phenomenon each country will get in specific picture. 203 street children picked up from different places of Tehran and settled at welfare center, where provides shelter for street children, were chosen for this study. These children were clinically examined by pediatrician and requested to answer the questionnaire ( asking about their gender; age; birth place; educational status; the origin of the family; sleeping place; occupation, income and social security of parents; number of siblings; reasons for being in streets; period of living in the streets; street friends; means of earning money; substance use. Smoking level was classified as heavy (10 and more per day), medium (1-9 per day) and rare (1-2 pe