I'm off to a fair start

My eating habits yesterday were a bit ridiculous. I did find that by staying busy all day I didn't have much of a craving to smoke, which I successfully accomplished. Later that evening I was invited to a dinner, where I was offered some drinks and accepted. I'm not sure which is a better plan: quitting things one at a time, or everything all together? I know I am feeling a bit short fused even I though I really haven't fully quit inhaling nicotine. At least I didn't smoke one cigarette yesterday, at least.