By Kieran King Rory Finneran became Blackburn’s youngest-ever player on Saturday, but the 15-year-old was forced to wear a sponsorless shirt because he is too young to vape. Finneran, who was born in February 2008, came on for his Blackburn debut in stoppage time as Jon Dahl Tomasson’s side swept aside Cambridge 5-2 in the FA Cup. The teenager replaced hat-trick hero Sammie Szmodics for the final few minutes at Ewood Park. However, Finneran had to wear a different jersey than the rest of his Blackburn teammates. This is because Blackburn are sponsored by vape company Totally Wicked, who became…