Hey guys I'm new here and just read the last few posts on page 1. I'm not trying to give anyone a bunch of crap and I'm not knocking ecigs as they are HEALTHIER than analogs but still not healthy.
Nicotine is not healthy but from what I understand as one of the poster's mentioned it doesn't cause cancer. Nicotine does effect the elasticity of the blood vessels, increase metabolism, I think blood pressure as was already mentioned and there are a few other downsides to it. I do not have any formal education on the subject but both my parents are nurses, my dad in particular has an extreme amount of education and experience in the medical field not to mention he's done a lot of research on this to try and help get my grandmother to quit.
As my dad put it an ecig will get rid of the cancer causing effects, respiratory effects but you will retain the cardiovascular effects. Switching to ecigs gets rid of the worst parts of smoking. My dad told me the time frame for full body recovery from my 7 years of smoking an average of 30 cigarettes a day is between 3-7 years (I'm 24). A few years to get almost back to baseline before I ever started and another few years to totally allow my lungs to fully replace the cells and tissue. Some of the potential cancer causing stuff will repair itself, some may not but the more time away the better chance I'll have. He also said the cardiovascular damage is something that at this point would take about 2 months maximum for my body to recover.
I once tried to tell a smoker friend of mine about this since he just bought an ecig and he pretty much blew me off which I guess is fine. All I'm saying is that nicotine does cause problems, the longer you do it the better the chance it will cause damage. For example my grandma's husband recently had a huge blood clot in his leg relating to all the smoking in his life and there was a serious potential for him to die if they couldn't remove or break up that clot. He's doing fine now, I believe they were able to break it up with meds or something but the point is nicotine does can have some serious effects that should not just be completely dismissed as harmless or non life threatening.