The group of study was again categorized on the basic of Couples smoking and non smoking habit, the ratio was changed. There was 121 boys for every girls on couples both father and mother not smoking. When both the partner smoked the ratio was 82 boys to 100 girls or 45% male. This shows the over smoking habit favour the girl child. So far there is no definite reasons to suggest actual affect of smoking in sex but hypothesis on the matter is the Chromosomal factors. That sperms cells carrying the Y Chromosome which is male determinant and X is the female chromosome. Probably over smoking cause the X chromosal effect and cause the Female child. It is therefore possible that smoking habits of parents around the time of conception could influence sex of the fetus. Further research may need to done on this but it is already proven smoking to health. So one should not do smoking throughout his life and even in the time of conception.