Saudi Arabia plans imminently to boost commercial ties with Lebanon after Lebanese authorities demonstrated "efficacy" in curbing drug smuggling to the kingdom over the past months, a senior Saudi official said on Thursday.Ties between Riyadh and Beirut have been strained for years due to the power of Iran-backed Hezbollah terrorists over Lebanese political and security affairs, but the kingdom sees an opening after the group was severely weakened by war with Israel last year.Easing controls on