Yes, there are less chemicals but since the product is smaller they are more concentrated but like the OP said he's replaced smoking with vaping so he's inhaling just as much or more of it due to the low cost and the availability, It all adds up. You know drinking soda everyday is bad then why are you vaping?
You can do what you want but modern medicine has let humans live well past
the age of 40-50 into our late/early 80s for most of the western population if they live like a normal person.
Unless you plan on having a high likelihood of developing cancer by the age of 40 then I'd suggest you stop now so your body can heal. It is all unnatural synthetic toxins at the end of the day and your body doesn't get rid of all of the toxins most of it is stored in your fat cells in your outer layer of skin. When you reach the age of 40 all of those chemicals being stored in you won't be effectively released as it once did when you were younger and it will then mount up and you'll inevitably develop cancer or some other debilitating disease. Your doctor will make you go on a chelating cleanse to purge your system but by that point it'll be too late.
You do not need to be a doctor or a scientist to know the repercussions of consuming or doing anything unnatural because it always ends in disaster.
You don't need to smoke or drink heavy to have fun, but It's your life.