People who smoke take longer to heal—from any injury, not just back pain. If you stop smoking, you may feel better sooner.
People who smoke are also much more likely to have back pain than people who don't smoke. This is because the nicotine and other toxins from smoking can keep spinal discs from getting all the nutrients they need from the blood, making disc injury more likely. These discs cushion the bones in your spine. An injured disc can cause low back pain.
Smoking also increases your risk of bone loss (osteoporosis).