I stopped a week before surgery and haven’t been smoking for 3 weeks post op.
Smoking negatively effects the healing of any dental procedure. It takes a minimum of 3 months for the implant to oseointegrate (become one with the bone), so smoking could cause this implant to fail. I would recommend staying away from smoking completely in order for your dental work to be successful. It may be hard to stop the habit, but 3 weeks is a great head start!