No. With the evidence, the magnitude of health risks and premature deaths that comes with sitting and smoking, the two cannot really be compared. The risks of chronic diseases are significantly higher than those associated with sitting. Individuals who spend long hours sitting have about 10-20% increased risk for cancers and cardiovascular diseases. Smoking, on the other hand, is linked to 80-90% of lung cancer deaths. However, sitting is still linked to numerous alarming health risks and should still be taken seriously.