For the curious, smoking may cause cancer and vaping may cause cancer.
They still cannot accurately explain how one smoker gets cancer and another doesn't, it's largely then turned to genetics, some people are more likely to be predisposed to developing cancer due to family traits (our genes). Now this doesn't fully fit either due to siblings both smoking yet one develops cancer and another does not (including twins).
Now don't take that as smoking is safe, it is not and while vaping is considered safer, that does not equate to safe. The best way to view it (using quality e liquids not junk) is that vaping is less toxic than smoking.
The safest thing of course is to not vape or smoke, as bringing anything other than plain air is considered harmful. This is what most doctors, scientists and even common sense tells us. There is however one thing missing.....How safe is the air you/we breathe?
Environmental conditions play a far larger role for most people being predisposed to cancer causing pollutants on a daily basis, especially in larger/over-populated areas, industrial areas, and well anywhere else on Earth.
The ugly truth is, unlike most would have you believe, there is no safe space. There are more people being diagnosed with cancer now than 50 years ago, is it because science/technology is better, cheaper, more widely available and it's being diagnosed sooner or are there more pollutants causing it?
There are studies that support both view points but studies can be made to show whatever one wishes. One has to look at who is providing the info and where they obtained it, then decide if it is trustworthy or not.
In the US, I don't trust many studies because of the contradictions. The gov. has made a push to remove smoking and/or make it less addictive, since it is dangerous (noble cause). Yet they have legalized (or ignored the legality) of other combustible substances, why? Smoke is harmful to the human body, ask any firefighter, so why expand combustibles if they are really out to save people?
Don't believe everything you read or see, especially on the internet and be very wary of studies that are politically sponsored.