East Belfast MP Mrs Long served alongside the former Progressive Unionist Party leader on Belfast City Council during her tenure as city councillor from 2001 – 2010.
Mrs Long said she extended her sympathies to Mr Smyth’s family following his passing.
“I was saddened to hear of Hugh’s death and his family, friends and colleagues have my deepest sympathies.
“Prior to his resignation due to ill health, Hugh was one of the longest-serving Belfast City Councillors, which reflected his popularity among the people he represented.”
ENDS