[Len_Brennan]

The smoking area has once again contributed massively to the house divide. Lisa quickly identified that this is the area where most damage can be done as she blooded Karly to be her apprentice - always 2 there are. Asking another housemate to join you for a smoke is a very powerful bonding tool, so once there, they are more open to listen to & adopt your views, away from the ears of those who don't smoke. Lisa recognised this early on & gradually Karly's mate Sophie wandered over for a chat, then Kris to Sophie, then Charlie to Kris and finally (to a lesser extent) Rodrigo to Charlie.
Say what you like about Lisa, but you have to admire her social skills. Similarly, you have to admire Freddie & Marcus for noticing & recognising the situation for what it it. They may be annoying as hell and have some serious character flaws, but these are the 3 smartest housemates by a distance. Siavash slightly less so.
Karly, Sophie, Charlie, Rodrigo & Noirin are merely pawns to be influenced by the main 3 to think/see things as they desire, and in Karly's case, carry out wounding attacks when necessary.
To be fair, the importance of smoking breaks/areas is not just a BB issue. You see the social exclusion it creates every day/night in work & pubs/clubs. Lisa was just smart enough to recognise it's value in house (obviously not from her experiences in the workplace mind you).