Following quantities of alcoholic drinks and tobacco products may be included for import within the duty free allowances admissible to various categories of incoming passengers:
-Alcoholic liquors or wines upto 2 litres
-100 Cigarettes or 25 Cigars or 125 gms. of Tobacco.
The Customs Tariff Act 1975 enlists the rate of duty over and above the mentioned quantities. It can be accessed at the link.