Smoking will not necessarily rule you out. However, you do need to be fit and well in order to see your child(ren) through to adulthood, and your adoption agency will consider all health and lifestyle-related issues as part of your assessment. They need to be sure that there are not no specific health risks to you or to the children who may be placed in your care. Different agencies will have different policies on smoking, but it is unlikely that children under five and those with some medical conditions would be placed in smoking households.