The effectiveness of the smoker's immune system is reduced. Tobacco smoking also increases the likelihood of stomach ulcers. Tobacco smoking effects the unborn child. Women who smoke during pregnancy have smaller babies on average than do non-smokers. There is an increased risk of premature births and a greater occurrence of miscarriages and stillbirths.
Tobacco can lead to physical and psychological dependence.
Tobacco smokers develop a craving for nicotine. This makes stopping smoking difficult. Withdrawal symptoms observed in people who have recently stopped smoking include sleep disturbances, tension and irritability. Non-smoker's health can be harmed by breathing tobacco smoke. Second-hand smoke can cause dizziness, headaches, faintness, sore eyes and throat together with nausea.