Hi everyone, I'm new to all this and haven't even got my first e-cig yet but was wondering if switching from tobacco to vaping will improve my energy levels. I've had a couple of heart attacks and really need to get more exercise but I smoke so much that I just can't handle it. Tried snus which did improve things energy wise but never liked them enough to quit smoking. My concern is that I may get off the cigarettes but still not have sufficient lung power for serious treadmilling. Any words of experience would be welcome. Thanks!