105 ILCS 5/34-18.11
The Board of Education shall prohibit the use of tobacco on school property when such property is being used for any school purposes. Neither the board nor the local school council may authorize or permit any exception to or exemption from the prohibition at any place or at any time, including without limitation outside of school buildings or before or after the regular school day or on days when school is not in session. "School purposes" include but are not limited to all events or activities or other use of school property that the school board or school officials authorize or permit on school property, including without limitation all interscholastic or extracurricular athletic, academic or other events sponsored by the school board or in which pupils of the district participate. For purposes of this Section "tobacco" shall mean a cigarette, a cigar, or tobacco in any other form, including smokeless tobacco which is any loose, cut, shredded, ground, powdered, compressed or leaf tobacco that is intended to be placed in the mouth without being smoked.
105 ILCS 5/34-18.11