Serious What disease do you think is the most deadliest?

Heart disease (CAD). When my panic disorder was in full swing I did a lot of research on heart problems because my chest hurt so much. My findings were enough to keep me paranoid for the longest time. Coronary artery disease takes up around 15% of all deaths worldwide? Something around that number but you get the point, it's killed a lot of people and it's a growing issue. A lot of people attribute the onset and increase of the disease due to sugar with some science backing it but I'm not a professional so I try not to assume. Either way it's scary.