Can water in your lungs cause down syndrome in unborn babies

No... Down Syndrome is a chromosome deficiency that happens during conception when a spem and egg fertilize. Sometimes the X and Y Chromosomes don't add up correctly and can (sadly) cause this deficiency. Water in the mother's lungs can cause pneumonia which can potentially harm the fetus due to lack of oxygen. But this cannot cause down Syndrome. Water in the baby's lungs will also not cause Down Syndrome.

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Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases.