1. Purdue

2. Iowa

3. Nebraska

4. Wisconsin

5. Michigan State

6. Illinois

7. Minnesota

8. Ohio State

(8.5) Notre Dame

9. Penn State

10. Michigan

11. Indiana

12. Northwestern

but I wish there was some sort of enforcement.  A $13 fine sounds just right to me.  From wikipedia, here are the effects of second-hand smoke:

Secondhand smoke causes many of the same diseases as direct smoking, including cardiovascular diseases, lung cancer, and respiratory diseases.^[2][3][4] These diseases include:

• Cancer:
  • General: overall increased risk;^[7] reviewing the evidence accumulated on a worldwide basis, the International Agency for Research on Cancer concluded in 2004 that "Involuntary smoking (exposure to secondhand or 'environmental' tobacco smoke) is carcinogenic to humans."^[4]
  • Lung cancer: the effect of passive smoking on lung cancer has been extensively studied. A series of studies from the USA from 1986–2003,^{[8][9][10][11]} the UK in 1998,^[12][13] Australia in 1997^[14] and internationally in 2004^[15] have consistently shown a significant increase in relative risk among those exposed to passive smoke.^[16]
  • Breast cancer: The California Environmental Protection Agency concluded in 2005 that passive smoking increases the risk of breast cancer in younger, primarily premenopausal women by 70%^[3] and the US Surgeon General has concluded that the evidence is "suggestive," but still insufficient to assert such a causal relationship.^[2] In contrast, the International Agency for Research on Cancer concluded in 2004 that there was "no support for a causal relation between involuntary exposure to tobacco smoke and breast cancer in never-smokers."^[4]
  • Renal cell carcinoma (RCC): A recent study shows an increased RCC risk among never smokers with combined home/work exposure to passive smoking.^[17]
  • Passive smoking does not appear to be associated with pancreatic cancer.^[18]
  • Brain tumor: The risk in children increases significantly with higher amount of passive smoking, even if the mother doesn't smoke,^[19] thus not restricting risk to prenatal exposure during pregnancy.
• Ear, nose, and throat: risk of ear infections.^[20]
  • Secondhand smoke exposure is associated with hearing loss in non-smoking adults.^[21]
• Circulatory system: risk of heart disease,^[22] reduced heart rate variability, higher heart rate.^[23]
  • Epidemiological studies have shown that both active and passive cigarette smoking increase the risk of atherosclerosis.^[24]
• Lung problems:
  • Risk of asthma.^[25]
• Cognitive impairment and dementia: Exposure to secondhand smoke may increase the risk of cognitive impairment and dementia in adults 50 and over.^[26]
• During pregnancy:
  • Low birth weight^{[3], part B, ch. 3}.^[27]
  • Premature birth^{[3], part B, ch. 3} (Note that evidence of the causal link is only described as "suggestive" by the US Surgeon General in his 2006 report.^[28])
  • Recent studies comparing women exposed to Environmental Tobacco Smoke and non-exposed women, demonstrate that women exposed while pregnant have higher risks of delivering a child with congenital abnormalities, longer lengths, smaller head circumferences, and low birth weight.^[29]
• General:
  • Worsening of asthma, allergies, and other conditions.^[30]
• Risk to children ^[31]
  • Sudden infant death syndrome (SIDS).^[32][33] In his 2006 report, the US Surgeon General concludes: "The evidence is sufficient to infer a causal relationship between exposure to secondhand smoke and sudden infant death syndrome."^[34]
  • Asthma^[35][36]
  • Lung infections^{[37][38][39][40]}
  • More severe illness with bronchiolitis, and worse outcome^[41]
  • Increased risk of developing tuberculosis if exposed to a carrier^[42]
  • Allergies
  • Crohn's disease.^[43]
  • Learning difficulties, developmental delays, and neurobehavioral effects.^[44][45] Animal models suggest a role for nicotine and carbon monoxide in neurocognitive problems.^[40]
  • An increase in tooth decay (as well as related salivary biomarkers) has been associated with passive smoking in children.^[46]
  • Increased risk of middle ear infections.^[47][48]
• Skin Disorder
  • Childhood exposure to Environmental Tobacco Smoke is associated with an increased risk of the development of adult-onset Atopic dermatitis.^[49]
• Overall increased risk of death in both adults, where it is estimated to kill 53,000 nonsmokers per year, making it the 3^rd leading cause of preventable death in the U.S.^[50][51] and in children.^[52] Another research financed by the Swedish National Board of Health and Welfare and Bloomberg Philanthropies found that passive smoking causes about 603,000 death a year, which represents 1% of the world's death.^[53]