Disease-Associated Maternal and/or Embryo/Fetal Risk Smoking during pregnancy causes increased risks of orofacial clefts, premature rupture of membranes, placenta previa, placental abruption, ectopic pregnancy, fetal growth restriction and low birth weight, stillbirth, preterm delivery and shortened gestation, neonatal death, sudden infant death syndrome and reduction of lung function in infants
So, while a doctor might infer drinking from a routine test, a does blood test detect alcohol query has a definitive yes with specialized tests like EtG and PEth
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If you're coming straight off the stuff, I guarantee you it's 100x worse (I've been there, too)
Chewing Tobacco and Oral Health A study by the University of Bern has examined the effects of chewing tobacco on oral hygiene in more detail