I went back to work when baby was 6 weeks and have since been nursing her to sleep at night. I did the same thing with my 8 year old when he was a baby and never thought anything of it. To be honest I am just so tired by the end of the night that I get lazy and know that she will go to sleep with very little effort.
I never had any issues with my son as he got older. Never put him to sleep with a bottle as he got older and was weaned. Anyways, I have read alot of conflicting information about nursing to sleep and have tried to weed through the information best as possible. I'm just not sure that I think it will cause harm. I'm also a co-sleeper and allow baby to comfort nurse. I guess I just break all of the rules.

I'm curious to know other thoughts and opinions on the matter.
Re: Nursing to sleep
ETA: LO sleeps in a bassinet next to me.
To add: Object permanence means that LO expects his environment when he wakes from a cycle to be exactly the same as when he fell asleep or it can lead to confusion and a greater need to be soothed back to sleep. Precious Little Sleep likened it to falling asleep warm and cozy in your bed and waking up on your front lawn which I thought was pretty descriptive. It is why a lot of pediatricians will suggest working on putting baby down drowsy but awake between 3-6 months so that he can learn how to fall asleep alone in his crib.
I just wanted to say, that you should do whatever works for you! I try really hard to just do what we need to do and not worry about things that may or may not create bad habits later. There will be plenty of "issues" for years to come, so I just deal with them as they come. I nurse to sleep, and Cosleep because it's helping me get enough sleep to go to work each day. When that stops working, I'll change our arrangement. I may be making it a little harder, but not enough for me to have, what i see as, unnecessary battles right now. I also think a lot of sleep advice is from years ago, when way less mom's were working full time.
Glad to hear it never created a problem for your older child!
This is a great article that made me feel much better. I nurse to sleep for naps and night. We still have a nightly routine, and he will not go to sleep before 11. I'm hoping that changes soon, other than that I follow his lead. Usually he only wakes 1-2 times over a 10 hr period which is awesome. With the leap and 4 month sleep regression he has just become unpredictable. I'm sick of hearing about sleep training and being told to let him sleep in the crib at night or crying won't hurt him. He's 3.5 months old and sleeps in a bassinet next to my bed. I think this article articulates my feelings and gives me reassurance. Hope it does for some of you too. The author is a lactation consultant.
There are SO many "rules" for raising kids that are actually just opinions. As long as baby is healthy and loved, you do what you gotta do to survive!
I nurse to sleep most nights and co-sleep. Occasionally, my husband will rock baby to sleep, and other times baby just passes out on his own. I'm sure what we are doing will cause one issue or another at some point, but I kind of feel that's unavoidable when it comes to raising kids