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The increase in SGPT may not be related to smoking but it suggests that there is some problem with liver like fatty liver;hepatitis
B;or it may be drug related like when you are on some medicines so please get the other investigations done to rule out hepatitis B and get a ultrasound
done to rule out fatty liver or gall stones
or infection of gall bladder
.With the reports consult a doctor for treatment help regarding the diet.