Drinking and using illicit drugs while pregnant is more dangerous than smoking throughout (not to say that's a good idea either). Drinking causes fetal alcohol syndrome and other neurological problems, and using other drugs can have similar effects as well as the baby being born addicted to the drugs.
Although I've noticed that people who's mothers smoked during pregnancy often become smokers themselves later in life. That's just based on anecdotal evidence though, but it's interesting.
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