A 23-year-old man has beenarrested with over seven kilograms of ganja in West Bengal's Howrah district, police said on Tuesday.Acting on a tip-off, personnel of Golabari police station raided Salt Gola Ghat on Monday night and made the apprehension, a police officer said.The accused, a resident of neighbouring Hooghly district, was booked under sections of the Narcotics, Drugs and Psychotropic Substances (NDPS) Act, 1985, he added.