PIH can be prevented by
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.
Polyhydramnios
Diabetes mellitus
Twin pregnancy
Smoking
Medical, surgical and gynaecological illness complicating pregnancy