Background: Teenagers and young adults (between 15 to 25 years of age) are more prone to addiction of tobacco & alcohol due to peer pressure and psychological triggering factors. This study was done to evaluate the pattern of Tobacco and Alcohol consumption among teenagers & young adult patients. Methods: A descriptive cross sectional survey was conducted between 15th Aug 2019 to September 15th 2019 in the Department of Oral Medicine and Radiology, Government dental college, Shimla amongst the teenagers & young adult population using self designed, close ended 20 questionnaires. Results: Out of total 318 patients in age group of 15-25 years present to the OPD, 250 people agreed to participate in the study. Among these 250 patients, maximum 131(52.4%) in the age group of 21-15 years, 130(52%) were males, 154(61.6%) were educated up to secondary level and 169(67.6%) were students. Among the total participants, 151 presented with the complaint of pain in tooth/oral lesion, 22 with trauma/ fracture, 1 with oro mucosal lesion and 76 with other complaints. Among the total participants, 56(22.4%) were smokers. Among these 56 smokers, 27(48.22%) were started smoking for <2 years, 39(69.66%) were smoking 8-10 times a day, 35(62.5%) initiating smoking due to the influence of their friends, 34(60.72%) were smoking cigrratte and 34(60.72%) tried to quit and among these 34 participants, loss of health was the reason for quit among 26(76.47%) participants. Among the total participants, 17(6.8%) were Non-smoking Tobacco users. Among these, 10(58.82%) were taking Jarda/Khaini, all 17 (100%) tried to quit and loss of health was the reason for quit among all 17 (100%) participants. Among the total participants, 71(28.4%) were alcoholic. Among these, 47(62.20%) were taking alcohol daily, 35(49.29%) started taking alcohol for < 2 years, 06 (8.45%) tried to quit and among these 6 participants, loss of health was the reason for quit among all 6(100%) participants. Conclusion:

Primary intraosseous carcinoma (PIOC) or Primary intraosseous squamous cell carcinoma (PIOSCC) is a rare carcinoma, which arises within the jaws without connection to the oral mucosa. It was first described by Loos in 1913 as a central epidermoid carcinoma of the jaw. The etiology of this tumor is still not clear. It is a rare case which arises by direct transformation of Odontogenic epithelial rests in the jawbone. The epithelial rests found within the periodontal ligament and alveolar bone. Remnants of the dental lamina and the reduced enamel epithelium surrounding anunerupted/impacted tooth, The present report describes a case of PIOC of mandible arising de novo in a 51-year-old-man, which was initially treated by a general dentist, who misdiagnosed it as a periodontal lesion.