Smoking
ah smoking. how much i used to love to smoke. more than food or anything else. just thinking about it makes me want a cigarette. i suppose if the world was going to come to an end in two months i would start up again. why not? the problem with smoking, besides the fact its supposed to cause cancer, is that if your a girl and you plan to have children then don't start! It changes your DNA at a celluar level and forever damages your eggs. this is a little known fact among the youngest of us. you see us girls are born with all the eggs we will ever have. so any toxins, drugs etc... can effect the outcome of the children you will have someday. and if you want to give your unborn the best brains possible just don't do it. that goes for drugs too. I am not saying your ruined forever if you have smoked. but i know i would like to have a child that gets straight A's and maybe is able to join the Mensa (group for the smartest in the world) because he or she is so smart.
and don't forget to pick a smart man that always helps. Note: if you pick a crazy man to breed with your kids will be nuts too. think gene pool.