Or your ecological ratio
To be aware of how much your living costs to the planet and how much you are friendly to the Earth ecology you should calculate and figure out your contribution to contaminate air, water and soil.
If you didn’t pollute air smoking tobacco or weeds areas under crops would be vaster. The farmers would grow ecological cultures to feed people or domestic animals. The exhaust of cars is a copybook truth. I’ve had my driving license for ages but I’ve been able to live without driving.
I do not urge you to cease sucking your over a kilometer long cigarette during your life if your goal is to smoke out it to the end ;-) Keep on doing harm which is going to lead you to destructive diseases, undermining the health of people who are around, including kids. I believe that being aware of how the whole situation sucks your resolution will be glorious.