The main concern about smoking and breastfeeding is that infants may have smoking-induced reductions to the milk iodine content. Smoking can adversely affect the lactation process by decreasing milk production and altering the milk composition. Smoking reduces daily milk output by roughly 250–300 mL. Not only will this be problematic on a daily basis for not producing enough milk, it will also cause the mother to wean her baby early. The altered milk composition also caused infants to exhibit daily behaviors such as colic and crying which can promote early weaning, again something that is not beneficial to the infant.