will it be ok for my health if i get pregnant at this age ?

Definitely. Stress, blood pressure levels, etc., can all have an affect on the baby's well being. It'd be best to see your doctor.

A quick google search "Smoking during pregnancy can cause a baby to be born too early or to have low birth weight—making it more likely the baby will be sick and have to stay in the hospital longer. A few babies may even die. Smoking during and after pregnancy is a risk factor of Sudden Infant Death Syndrome (SIDS)."