Thu May 8, 2:03 PM ET
"I've asked all the presidential candidates whether America should be smoke-free," he told a Senate committee hearing on how to tackle cancer.
"The consensus is that it's better left to the cities and states," he said, agreeing that state- or community-level bans were "the way to go."
"Second-hand smoking is something I'm very passionate about," he told the committee.
"I don't like to sit next to someone who's smoking in a restaurant -- I raced for 15 years in Europe and I've been around enough cigarette smoke to last me a lifetime," said Armstrong, who overcame metastisized testicular cancer to win every Tour de France from 1999 through 2005.
Since he retired from professional cycling, Armstrong has become a leading advocate in the fight to beat cancer, a disease which, he told the hearing, claims 560,000 American lives a year.
Around one-third of cancer deaths are linked to smoking.
Armstrong said banning smoking, or using other means to make people never start, or kick a tobacco habit, were good preventive measures against cancer.
"We know what works in terms of cancer prevention -- targeting tobacco, sun, diet and exercise.
"You now have cities like New York; Austin, Texas that are smoke-free," Armstrong lauded, before looking to the traditionally smoke-filled pubs, cafes and bars of Europe.
"Ireland has taken steps," he said.
"For God's sake, even Paris, France is smoke-free."
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