Mortality is dropping in the richer countries https://www.cdc.gov/pcd/issues/2016/16_0211.htm https://www.cdc.gov/pcd/issues/2016/16_0211.htm (2014) Smoking an

Mortality is dropping in the richer countries https://www.cdc.gov/pcd/issues/2016/16_0211.htm https://www.cdc.gov/pcd/issues/2016/16_0211.htm (2014) Smoking and medicine. People seemed to think smoking was lung cancer, when it was always about cardiovascular health. (It was also about smoke not tobacco) Poorer countries climbing, a lot due to other diseases lowering. You'd need to really drill down to find where to link it to Alzheimers, assuming this best guess from the researchers is correct. It seems a very good guess, it fits in a few places.