The chest pains or angina are most likely attributable to one of herb most common physical side effects. Herb will almost always induce a increase in heart rate. Especially so in those whose tolerance is minimal. This pulse rate increase is often accompanied by a rise in blood pressure. The chest pains you describe are a possible warning sign. Try smoking less but more frequently, this will build a base tolerance and ideally rid you of this reaction. If that fails, I would probably have your blood pressure checked just in case.