Answer:
vegans would be iron
Explanation:
they don't eat iron rich food such as steak
They have a lower chance of second hand smoking, which is one of the leading causes to lung cancer for non-smokers. Also if given the fact that the smoker is a spouse, they won't have the price to smoke regularly taken out of their shared salaries. Finally above, if the smoker was to quit, they have a a greater possibility to live longer, refrain from injuries (such as removed limbs, the falling out of teeth, cancer, a stoma being placed in their neck, the discoloration of teeth and nails, excessive ageing, ect.) and there forth saving the individual from mutual emotional stress of dealing with a known, or loved one going through the possible side effects in the future.
The circulatory system :)
