FILE - In this Feb. 20, 2014, File photo, a patron exhales vapor from an e-cigarette at the Henley Vaporium in New York. The first peek at a major study of how Americans smoke suggests many use combinations of products, and often e-cigarettes are part of the mix. It's a preliminary finding, but it highlights some key questions as health officials assess electronic cigarettes. (AP Photo/Frank Franklin II, File)

“Are e-cigarettes a step toward a cigarette smoker getting off of cigarettes? Or are e-cigarettes a crutch so they can get nicotine in places and times when they wouldn’t normally be allowed to smoke cigarettes?” asked Dr. Andrew Hyland of the Roswell Park Cancer Institute, the primary investigator for a huge government study of trends in smoking and tobacco use.

DENVER | Colorado Democrats have defeated a move to limit bonuses to people working at the health insurance exchange. A House committee rejected a bill Thursday to require lawmakers to approve before the exchange awards employee bonuses. The bill earlier cleared the GOP Senate. Republicans say lawmakers need more control over the operations of Colorado’s quasi-public […]

FILE - In this Friday, Dec. 19, 2014 file photo, an ultraviolet growth light illuminates a marijuana plant in a grow room at the 3D Dispensary in Denver. A bill is being considered by Colorado lawmakers on Thursday, Feb. 26, 2015, to crack down on medical pot users. (AP Photo/David Zalubowski, File)

“For a lot of years now, law enforcement has struggled to identify legitimate caregivers and marijuana grows and those that are operating illegally,” said Doug Darr, the retired Adams County sheriff who testified on behalf of the statewide sheriff’s association.

First lady Michelle Obama speaks at the annual Building a Healthier Future 2015 summit in Washington, Thursday, Feb. 26, 2015.  (AP Photo/Jose Luis Magana)

“Even today, some folks are still arguing that we just can’t afford to serve our kids healthy food, that it’s too expensive,” she said in a reference to new federal requirements that more fresh produce and whole grains be served in schools.

DENVER | Colorado’s most controversial marijuana-related bill of the year is up for its first test in the Senate Thursday. A measure to crack down on medical pot users faces a hearing. The bill would increase oversight on doctors who recommend marijuana for severe pain, the most common ailment on Colorado’s medical marijuana registry. The bill […]

A doctor's assistant prepares a measles vaccination in Berlin, Germany, Tuesday, Feb. 24, 2015. An 18-month-old boy has died of measles amid an outbreak of the disease in Berlin, a hospital in the German capital said Tuesday. An autopsy on the child, who wasn't inoculated against measles, showed that he had an unspecified other disease as well but that wouldn't have led to his death without the measles infection, the Charite hospital said. (AP Photo/dpa, Lukas Schulze)

“There’s a misconception that measles does not kill in developed countries, but it unfortunately still happens,” said Dr. David Elliman, an immunization expert at Britain’s Royal College of Paediatrics and Child Health, citing similar deaths in the U.K. in recent years, mostly among people with other health problems, like asthma.

FILE - In this Thursday, May 10, 2012 file photo, a doctor holds Truvada pills at her office in San Francisco. A study released Tuesday, Feb. 24, 2015 shows that the drug, used to treat HIV infection, also can help prevent it when taken before and after risky sex by gay men. The study, done in France and Canada, is the first to test "on demand" use of Truvada, a pill combining two AIDS drugs, by people planning to have risky sex. The uninfected men who took it were 86 percent less likely to get HIV compared to men given dummy pills. (AP Photo/Jeff Chiu)

“That impressed me,” Dr. Scott Hammer said of the size of the benefit. He is an AIDS specialist at Columbia University in New York and heads the Retrovirus Conference going on in Seattle, where the results were discussed Tuesday.