Passive smoking and health effects.

Methods of monitoring passive smoking vary in accuracy and expense. Annoyance is easily identified among smokers and non-smokers alike. Sensory irritation does occur, but the threshold is difficult to establish. Infections in children appear to be generally correlated with mother's smoking and by amount of smoking per day. The effect on children's lung function growth has been established, but amount varies. Passive smoking has a blunting effect on response to other irritants and asthmatics are more susceptible than others.