Ramu must discuss the issue with his parents or teachers. He must take support from elders in not being a part of this group so that he can take care of his physical and mental health and not fall a prey to bad habits. Friendship does not mean being a support to the wrong actions of our friends.

Diabetes Mellitus is a chronic metabolic disorder. It is characterized by increased blood glucose level due to insufficient, deficient or failure of insulin secretion. This is the most common pancreatic endocrine disorder.
Type I Insulin dependent diabetes mellitus (IDDM):
(i) IDDM accounts for 10 to 20% of the known diabetics.
(ii) The condition also occurs in children (Juvenile onset diabetes) and young adults, the onset is usually sudden and can be life threatening.
(iii) This is caused by the destruction of cells of the pancreas.
(iv) It is characterized by abnormally elevated blood glucose levels (hyperglycemia) resulting from inadequate insulin secretion.
Causes: Genetic inheritance and environmental factors (infections due to virus, acute stress) are the cause for this condition.
Type II Non-Insulin Dependent Diabetes Mellitus (NIDDM): 
(i) This is also called as adult onset diabetes and accounting for 80 to 90% of the diabetic population.
(ii) It develops slowly, usually milder and more stable.
(iii) Insulin production by the pancreas is normal but its action is impaired. (iv) The target cells do not respond to insulin.
(v) It does not allow the movement of glucose into cells.
Causes: The causes are multifactorial which include increasing age obesity, sedentary lifestyle, overeating and physically inactive.

(i) Obesity is the state in which there is an accumulation of excess body fat with an abnormal increase in body weight.
(ii) Obesity occurs if intake of calories is more than the expenditure of energy.
(iii) Overweight and obesity are conditions where the body weight is greater than the mean standard weight for age and height of an individual.
(iv) Body Mass Index (BMI) is an estimate of body fat and health risk. BMI = Weight (kg) / Height (m)²
Causes and risk factors :
(i) Obesity is due to genetic factors, physical inactivity, eating habits (overeating) and endocrine factors.
(ii) Obesity is a positive risk factor in development of hypertension, diabetes, gall bladder disease, coronary heart disease, and arthritis.
Prevention and Control of Obesity :
(i) Diet Management: Low calorie, normal protein, vitamins and mineral, restricted carbohydrate and fat, high fiber diet can prevent overweight.
(ii) Physical exercise: A low calorie diet accompanied by moderate exercise will be effective in causing weight loss. Meditation, yoga and physical activity can also reduce stress related to overeating.

The following steps may help in controlling and prevent the spreading of HIV infection:
(i) Screening of blood from blood banks for HIV before transfusion.
(ii) Ensuring the use of disposable needles and syringes in hospitals and clinics.
(iii) Advocating safe sex and advantages of using condoms.
(iv) Creating awareness campaign and educating people on the consequences of  AIDS.
(v) Persons with HIV/AIDS should not be isolated from the family and society.

When smoke is inhaled the chemicals get absorbed by the tissues and cause the following harmful effects.
(i) Benzopyrene and polycyclic hydrocarbons present in tobacco smoke is carcinogenic causing lung cancer.
(ii) Causes inflammation of throat and bronchi leading to conditions like bronchitis and pulmonary tuberculosis.
(iii) Inflammation of lung alveoli decrease surface area for gas exchange and cause emphysema.
(iv) Carbon monoxide of tobacco smoke binds to hemoglobin of RBC and decreases its oxygen carrying capacity causing hypoxia in body tissues.
(v) Increased blood pressure caused by smoking leads to increased risk of heart disease.
(vi) Causes increased gastric secretion which leads to gastric and duodenal ulcers.
(vii) Tobacco chewing causes oral cancer (mouth cancer).