The effects of any drugs ( including tobacco ) vary from person to person .How tobbaco affects a person deponds on many things including their size ,weight,and health. also weather the person is used to taking it.The effect of tobbaco, as with any drug,also depond on the amount taken use of any drugs always carries some risk even medications can produce unwanted side effects .it is important to be carefull when taking any type of drug .Tar in cigarettes coats the lung and can cause lung and throat cancer in smokers. It is also responsible for the yellow brown staing on smoker,s fingers and teeth ,Caron monoxide in cigarettes reduce the amount of oxygen available to the muscles, brain and This means the whole body especially the heart must work harder, over time this cause airways to narrow and blood pressure to raise,which can lead to heart attack and stroke. High level of carbon monoxide, together with nicotine increase the risk of heart disease, hardening of the arteries and other circulatory problem. Passive smoking occours when a person who is not smoking Breathing in the smoke from people who are smoking, passive smoking irritate the eye and nose and cause a number of health problems such as heart disease, lung cancer .tobacco smoke is especially harmful to babies and young children. There are more than 5000 thousand chemical found in cigarette smoke and hundreds of them are harmful to human health according to the Center for disease control and prevention there are many of the dangerous chemical found in cigrat.there are many more.but you do not have to spend the rest of your life givig in to your addiction, thousand of peoples kick the habit every year and you can be one of them. It may not be easy but you can do it.