PIH can be prevented by: (A) Polyhydramnios, (B) Diabetes mellitus, (C) Twin pregnancy, (D) Smoking
Answer is D. Smoking is the only environmental factor that reduces the risk of pre-eclampsia Smoking during pregnancy has adverse effects on other organs It may have effects on angiogenic factors, endothelial function and immune system reducing the risk of pre-eclampsia. Ref: Internet sources.