The greenhouse effect traps heat near the surface and raises the temperature, just like a blanket. :)
Answer;
Low birth weight.
One of the most consistent and best documented effects of cigarette smoking during pregnancy is low birth weight.
Explanation;
Smoking during pregnancy has various effects on the fetus, causing a baby to be born early or to have low birth weight which makes it more likely for the baby to get sick and stay in the hospital longer.
Additionally; smoking during and after pregnancy is a risk factor of Sudden Infant Death Syndrome.
Dopamine is a chemical released by neurons to send signals to other nerve cells. the brain includes several distinct dopamine pathways, one of which plays a major role in reward motivated behavior.
smoking is a habit, in a habit there is the cue, routine, and reward. with smoking the cue can be different things, most commonly stress or anxiety. the routine how you react to those cues, the reward is the chemical 'triggers' that are pulled inside you're brain leaving you feeling calm, happy, or relieved, etc.
