WELL, IT WILL DO NOTHING BUT KEEP YOU CONNECTED TO SMOKING.
There are plenty who will say,
I only had one cigarette today.
But, hanging and clinging to that crutch
It Don't Help Smoking Go Away Much. 🙂
Added
So if you have't yet quit, clinging to that one cigarette is certainly not arresting any continual nicotine urge.
It simply shows your indecision. (that is you holding yourself back)