Is there a valid reason we accept studies that have not been reproduced at least one more time to truly vet them before the community?
Well, you shouldn't. It's usually the press that blows a single study way out of proportion, because they have no understanding of how science works. Science *always* generates contradictory results early on as it gets the kinks worked out of a hypothesis. This is not some kind of failure of science, it's the way science is supposed to work. A critical follow-up attempt to check on some study's results is *of course* much less likely to reach significance, because of researcher bias either way.
The gold standard for judging the state of science isn't a study, it's a review paper. This is a peer-reviewed paper, written by someone working in the field, summarizing the state of published evidence on some question in that field. These are supposed to be both comprehensive and extremely conservative in their findings.
Science is continually producing a streams of contradictory evidence. You should either pay very little attention to some new scientific idea, or be prepared to follow along in great detail over several years. But even forty years ago, when my local newspaper used to publish a whole section of science news one day a week (!!!) you could pretty much count on most of the media ridiculously overreacting to a juicy sounding bit of scientific controversy. What can you expect of today's emasculated and dumbed down reporting?
Imagine the media response if there were a study that came out that purported to show that smoking e-cigarettes was beneficial to health. It would be a media circus, but only the start of a long process in the scientific community. So rather than lighting up your e-cigarette, you should wait for the critiques and counter-studies to pile on, and then for a few review papers to come out after the dust settles. Most new ideas in science, like most new businesses, fail after a year or two.