Most of them have to do with how women are somewhat better equipped to have children than men.

For instance, smoking (or any kind of nicotine, actually) does not go with oral contraceptives, it brings on menopause more quickly, makes women infertile, makes their periods more troublesome, and makes breast cancer a more threatening possibility.

Women can still learn to live with these risks for the most part, if it weren’t for the problem of pregnancy. Breastfeeding and smoking alongside hardly makes anyone feel good, least of all the baby.