Ah, but I specified "strongly" for a reason - the chances that a drink of wine will cause problems for a fetus (and therefore, future person) are so small as to be possibly non-existent. A strong teratogen is a different issue. So I do think ingesting a strong teratogen while pregnant should be illegal (as in the state should have a right to step in and stop it), whereas a very weak one should be a taboo. (and with alcohol, I feel like the evidence suggests that the taboo is already stronger than it really needs to be).

Smoking the presence of others should be discouraged, but secondhand smoke is a weak carcinogen. Smoking anthrax-spore sticks, on the other hand, should be very much illegal.