Dozens of healthcare reform advocates are sounding alarm bells over a Senate proposal to allow companies to reward employees who quit smoking, exercise or engage in other healthy activities.

The groups, including the American  Heart Association, say the measure would create a “dangerous”  loophole that would allow insurance companies to discriminate against people with health problems if it is included in the final healthcare yoga2reform legislation.

The healthcare overhaul aims to stop insurance companies from excluding coverage for people with pre-existing conditions or charging people more based on medical history. But Sue Nelson of the American Heart Association said the provision is written in a way that would allow insurers to raise premiums but then provide discounts, as much as 50 percent, for people who quit smoking or join gyms and exercise more.

“Although described as  ‘incentives’ this practice allows employers to raise costs across the board for everyone and then lower them selectively for those who meet certain health targets. Incentives quickly become penalties for those who cannot meet the targets,” Nelson said.

Supporters of the provision argue that encouraging people to quit smoking or engage in a healthy lifestyle would help bring down soaring healthcare costs. Current law allows up to 20 percent premium discounts for people who engage in employer-sponsored wellness programs.