It is bad because when you smoke all of those drugs you are takings into your body goes right to the child! Smoking takes oxygen out of your blood. Your baby needs all the extra oxygen your body is...
Too much Vitamin A has been seen to cause birth defects and liver toxicity. Vitamin A in the form of Beta-Carotene (carotenoids) is okay, and actually necessary for proper fetus development and...
I personally do not believe it is bad. In fact, there are studies today indicating the benefits of coffee. However, I believe the best answer is, "everything in moderation."