Smith believes that despite there being only three games remaining, points could still be dropped, and even Gordon Strachan's mate Mark McGhee has warned there could be a final sting in the tale.
The momentum is now with Celtic but McGhee believes they still have the hardest task of the lot.
"I think Celtic have still got a job on to go to Tannadice. I think the two games that Rangers have (against St Mirren and then away to Aberdeen], if they can regroup and freshen up, are both a lot more winnable than the Dundee United game. I think Celtic have the hardest of the three games because at Dundee they are a difficult team to beat and they have a manager who will remain focused, regardless the circumstances surrounding the game."