When pregnant women smoke, blood vessels—including those supplying the placenta—constrict. Blood flow is compromised and the fetus may be deprived of oxygen and nutrients. The risk of placental abruption, premature separation of the placenta from the uterine wall, is increased.

Convection is the transfer of heat through the motion of heated liquids, gases, smoke, hot air or flying embers.

So, yes, your dentist will know if you smoke. Among the telltale signs include yellow teeth, plaque, receding gums, and more.

Smoking and pregnancy don’t mix. Smoking while pregnant puts both you and your unborn baby at risk. Cigarettes contain dangerous chemicals, including nicotine, carbon monoxide, and tar. Smoking significantly increases the risk of pregnancy complications, some of which can be fatal for the mother or the baby.

Smoking during pregnancy can cause problems for your baby, like premature birth and birth defects. It also increases your baby’s risk for SIDS. If you’re pregnant, don’t smoke and stay away from secondhand and thirdhand smoke. If you need help to quit, tell your health care provider.

Smoking during pregnancy can also affect a baby after he or she is born, increasing the risk of: Sudden infant death syndrome (SIDS) Colic.

Alcohol use in first 3-4 weeks of pregnancy may lead to permanent brain changes in offspring. It is well established that consuming alcohol during pregnancy can cause harm to the fetus.

Generally, you should avoid drinking alcohol during the two-week wait. The first few weeks after conceiving can be very critical, and it is better to be safe than sorry. However, you should not blame yourself if you have had a drink or two before the positive pregnancy test.

“There is no known safe amount of alcohol — even beer or wine — that is safe for a woman to drink at any stage of pregnancy,” the CDC says. The American Academy of Pediatrics issued a similar warning, citing longstanding advice that no one knows if even one drink is too much.