Exactly what Robert Cromwell said, it can complicate certain health problems but it has never been shown to cause them by itself. It also is not linked to cancer in anyway, even though on California made juice bottles, it will state that falsity. It's pretty much in the same ballpark as caffeine, sugar, etc.
Nicotine has even undergone/going scientific research for its potential benefits, such as pain relief and benefits such as a decrease in blood pressure over time, etc. I do not have the direct reference link of the scientific studies, but I'm sure using keywords from this you could find it yourself.
While nicotine temporarily increases heart rate, increases blood pressure, it's not permanent and always will go away upon stopping use.
Nicotine isn't even addictive itself, it's been shown those who are given nicotine solely do not form a dependence. Nicotine has been entirely hyped of how its "dangerous", what you really should be worrying about is sugar consumption. 45g of sugar in an 8oz soda? People don't understand how ridiculous that is at first glance, not to mention high fructose corn syrup, aspartame, and all these other artificial ingredients you can find in most foods that our bodies are not designed to digest.
Perhaps you'll call me a conspiracy theorist... but it's almost as though they want us to eat all of this terrible artificial foodstuff. Do the research yourself, educate yourself on it by reading. Avoid articles and any site that doesn't give reference links and make sure to check the reference links for anything that doesn't match up, also check that the reference links you read are of a reputable source as well.
Question. Everything.