New research from the U.K. points to vaping as a potential drag on young adults' fitness on par with smoking. In the study, healthy adults ages 18 to 30 who used either cigarettes or vapes had similarly poorer exercise capacity, coming in about 15% below people who had used neither. What's happening? The study was led by Manchester Metropolitan University researchers and published Tuesday in the peer-reviewed journal ERJ Open Research. The rese…