Only just occurred to me...
 

When Kieran entered the house he made a very clear statement that he was no longer a smoker and had stopped completely. As seen in last nights episode Kieran was shouting "I need a fag"

Bit of a shame that his time in the house lead him to smoking again..

Keeping up the "nice guy" charade for 8 weeks has got to be stressful, especially as in everyday life you are a bit of a dickhead (said Rebecca etc).