Hi. I appreciate your concern. As per your question ,effects of smokig cigarettes depends on person to person s immunity age and sex. Tobacco smoke is enormously harmful to your health. There’s no safe way to smoke. . Cigarettes contain hundreds of ingredients. When they burn, they generate thousands of chemicals, . Many of those chemicals are poisonous that can cause cancer. . carcinogens, toxins, and tar are products that left behind when cigarette is burnt....these biproducts effects all the systems in our body from digestive to reproductive system.One of the product formed in a burning cigaretteis nicotine which is a nerve stimulater and boosts up your energy level just for some time. Due to this you go on addicting to it. Cigarette smoker is at greater risk in development of mouth and throat cancer,gums diseases. Smoking person is also at a greater risk in development of diabetes,blood pressure,stroke and heart attack,coughing and asthma due to irritants produced......so wether 1 or 2 its never going to help you in any way.It will always decrease your level of immunity.You should quit this habit not abruptly but slowly which will may cause irritability,dizziness,headaches and sleep problem but not to worry .it will slowly go away as you get involved in other things.I am sure my information helps you.