Re: an experiment
I can tell you exactly what happens to you as you we see your BP go up and the body will begin to compensate due to the increase in nicotine (even trace amounts), vasoconstriction will occur and will last for sometime an hour maybe a little longer. In a weeks time of constant smoking, the body will have change to operate with a decrease in o2 levels in a day's time.
You must realize that it maybe not be substantial differences between week to week as it takes time to tell and alot of variables to conduct an experiment like this. I can give you a complete scientific analysis of lung cap., anatomy, physiology, the bodies reaction to co2 and o2 and it's correspondence to blood. and vital organs. but it will be completely long winded and honestly boring.
Nonetheless im interested in what your findings come up with.