… if I have smoked during pregnancy?

There is concern that the heavy metals found in cigarette smoke (eg. lead, cadmium) is stored in the placenta and therefore would be consumed in the capsules.

According to APPA*, “the consensus amongst medical professionals is that the benefits of an infant consuming breast milk in this situation greatly outweighs any risks that these heavy metals may, or may not have on the developing infant.” 

These heavy metals are a part of our environment, foods, and have become something that our bodies contain. It is suggested that the benefits of placenta consumption outweigh any minimal risks to the mother. I always leave the decision up to the mother after providing this information.

https://placentaassociation.com/uncovering-the-truth-about-bacteria-and-heavy-metals-in-the-placenta