You can play sports if you smoke, though your performance will likely be impaired relative to what it could have been if you had never smoked.
If you're in high school, smoking on school grounds is usually enough of an infraction to get you suspended from school, which by most state activity association rules has a negative impact on your eligibility to participate in intramural sports. That might be what you were thinking of.
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Smoking is bad for everyone. However a footballer is a person that needs to be in peak condition. The tars and another chemicals that are left behind in lungs of a person will have the effect of making less oxygen available to the body especially during periods of heavy exercise. Aside from this making the person less capable of speed strength and will also cause more damage to be done to overworked muscles like the heart.
They will not be able to perform as well because of the difficulty breathing smoking causes.