Hello Bullitnut,
My apologies, I did not see your question. Smoking is widely recognized as an inhibitor to wound healing but there haven't been any wide scale studies that I'm aware of.
Some of the ingredients have well known effects on the body during wound healing. For instance, nicotine is a vasoconstrictor meaning it reduces the amount of blood flow, thus the amount of nutrition, that any wound needs for repair. Oxygen transport is reduced by hydrogen cyanide and carbon monoxide. Proliferation of red blood cells and fibroblasts is also lessened. All of these and more are necessary for optimal wound healing and the longer it takes for a wound to heal the greater chance exists for a negative outcome. We wants the body to be back to normal as soon as possible so the process of recovery and growth can begin.
Smoking is not going to destroy a result but if a patient is a regular smoker and has a good hair transplant result there is a chance that the patient may have had a better esult if smoking were not included in the overall equation.