Like you.
No, you should not drink, smoke, or do drugs as this can cause birth defects and the baby will be addicted at birth.
Clarification needed: do you mean the baby is ingesting it, the baby is in the room where it is being smoked, a pregnant woman is smoking it, or a pregnant woman is exposed to the smoke? It is...
it doesn't!
Of course they will.
Chemicals in the smoke transfer to the mother's blood. Some of these can cross the placental barrier, and transfer to the baby's bloodstream.