The post is great, it needs to raise awareness about the harmfulness of cigarette smoking.
As far as the mechanism itself is concerned, it can be different. My pre-suppression is that this is most common - Smoking cigarettes leads to an accelerated development of atherosclerosis of the systemic arteries, which causes high blood pressure, and hence the increased intake that the left chamber must overcome to ensure adequate blood flow through the body. And the work versus increased pressure leads to hypertrophy of the left ventricle and further on what you have described!
Keep writing these articles, they're really great!