NY Times "Smokers Surcharge"

Smokers have 25% greater health care costs than nonsmokers. So if their health insurance cost more, should the employer or employee take the hit? If the employer takes the hit can they discriminate against employees who are not healthy? Great NYT article: http://www.nytimes.com/2011/11/17/health/policy/smokers-penalized-with-health-insurance-premiums.html?_r=1&smid=tw-nytimeshealth&seid=auto