>>2242447>implying the damage done is significantIt isn't. The lung evolved over hundreds of millions of years as an organ and mechanisms exist in it to filter out and handle particulate matter, especially if they are small, easily broken down organic compounds.
There are also antioxidant compounds in tobacco smoke that easily attenuate most if not all of the damage done.
Nor, will using tobacco cause lung cancer. There is yet to be a single study that has been able to induce cancer in an experimental design.
If it caused cancer, surely experimental studies (hard science) would show the same results as the human epidemiological ones.
See for yourself.
https://www.ncbi.nlm.nih.gov/pubmed/9608635 