good for you for making the sensible decision not to rely on cigarettes for stress control! it's much better to learn good coping techniques than to self-medicate. the good news is you probably did not irreversibly harm your lungs by smoking lightly for a month. even heavier smokers can "undo" the damage to their lungs to a certain extent by quitting. if you're young and you maintain a smoke-free lifestyle you should do just fine. i hope this sets your mind at ease!
i smoked cigs for 1 month averaging about 3 a day. just wondering if any irreversible was done. i did quit since then. i started smoking for a month after a period of depression a couple of months ago 2-3 cigs most days with a couple more on bad days. i would estimate i probably had 4 packs total over the period. i went cold turkey as i started to get my life together and hated the ill feeling from them. i exercise regularly and eat healthy and i am still young. i would just like to clear my head and hear that i did no damage permanent to my lungs. i know it takes a bit to recover hopefully to 100%.