Tycoon Anutin Charnvirakul is causing a splash in Thailand’s general election by campaigning for the legalisation of household marijuana cultivation, a populist policy that could help him become prime minister.His Bhum Jai Thai party would let households grow up to six cannabis plants, Anutin said in an interview, enabling people to supplement their incomes by earning as much as US$2,200 per kilogram of the crop.