Beijing Capital Airport T3 landing from London T3 departing to Manila.Air China both flights

Hi.We will be arriving at at T3 Beijing from London and departing T3 to Manila both flights Air China.

I am travelling with 2 small children and I have difficulty staying in my feet for any length of time due to a foot injury.Normally I do not need the assistance of a wheelchair but can you please tell me what is the process transferring in the same terminal.Will I need to go through checks even though we are not changing terminals and 1 of our party is a Philippines passport holder.will we come up against any problems?Last question.i have an electronic cigarette.is there any laws that will see me in trouble for carrying it and will they confiscate from me whilst transferring?Thanks