M.B.
I know it sounds like a tough thing to do, but I wouldn't let her sleep through the nite at this stage (unless your defining sleeping through the nite to be from midnite to 5am). To ensure I had an adequate milk supply for my second son, I would only let him sleep for 4 hours at nite and then I would nurse him. He was often in bed for the nite before 8pm. So, I would wake up at around midnite and nurse and then nurse again at 4am. He was usually up by 6 and then we were on the every 2-3 hours schedule during the day. They really don't need to wake up too much to nurse and it was harder for me than him, but it did ensure that by 4 weeks he had gained almost 4 pounds.
You can google and find that smoking/nicotine does interfere with breastfeeding by both impacting the milk supply and the letdown. Here's an example:
http://www.netwellness.org/question.cfm/10103.htm
It mentions that the nicotine also impacts the level of fat in the milk, which means your baby may not gain weight well. It does say, however, that if you smoke, you should only do so right after you nurse and that it's out of your system in 2-3 hours. But, if your baby is nursing every 1-2 hours, then she is getting some nicotine, which could contribute to her fussiness. So, if you really need a cigarette, it's likely best to keep your smoking till after she's in bed for the nite.
You're doing good by wanting to continue with the BF once she gets into daycare/homecare as you will be really helping her immune system.