Your question involves back pain from pars fracture, also known as Spondylolysis.
Generally speaking, many individuals continue to have pain with this condition, most of the time due to lifestyle provocation, such as lifting objects with bad posture, or performing movements that exacerbate the condition, which usually involves extension of the spine. Most of this pain is relieved with rest.
Outside of structural therapies that focus on spinal alignment, you may consider the use of anti-inflammatory natural therapies, which have shown promise. For example, vitamin D deficiency, which is extremely common, has been shown to increase inflammation, thus making pain levels worse. Other factors, such as low antioxidant levels, which you are at high risk for since you are a smoker, can contribute to rising inflammation levels.
Both of these areas may be covered by a competent certified nutritionist, of which you may be able to get a recommendation by your physician.
Sam Visnic NMT
www.Endyourbackpainnow.com/blog