Good for you being able to hold off on cigs like that..i was able to do that when i first started smoking but after bingeing on coke many times cigs became my replacement for when i was out of weed
if un-opened you are fine..if they are opened id say 3-4 days they are good, but id still smokem
I really dont notice a difference in a "bad" or "good" cig maybe ive never had a "bad one"
but you should be okay, you wont notice a difference if you are not a daily smoke
i can make a pack of 100's last 2-4 days and they dont go bad so i think you are alright
its like the saying "smokem if you gotem"