A pack of cigarettes a month is a relatively small amount of smoking, but long-term smoking may reduce the body’s immunity, induce cardiovascular disease, jeopardize the health of the lungs, lead to stroke and harm the brain. 1. Lower immunity: long-term smoking people, the body’s immunity will be relatively low, resulting in bacteria or viruses more easily invade the body, thereby increasing the risk of disease. 2. Induce cardiovascular disease: cigarettes in the combustion may produce harmful substances in the body, will damage the endothelium of the blood vessels, prone to thrombosis and thus serious consequences. 3. Hazardous to lung health: in the process of smoking, a large number of toxic and harmful smoke into the lungs, will lead to increase the chances of lung cancer. 4. Lead to stroke: the toxic and harmful substances in cigarettes damage the endothelium of blood vessels, which can lead to thrombosis and arteriosclerosis, all of which may lead to the emergence of stroke. 5. Hazardous to brain health: cigarettes affect the supply of oxygen in the blood, leading to a decrease in blood oxygen, affecting blood circulation, and it may cause damage to the nerves, which in turn affects the brain’s oxygen supply and health. Smoking may also cause other harms, so try to actively quit smoking to benefit the physical and mental health.