CBS and colonic neoplasm: The hydrogen sulfide derived from cancer cells also promotes tumor growth and proliferation by acting as an autocrine and paracrine factor.72 After introducing a CBS inhibitor, the growth of colon cancer could be greatly attenuated by efficiently reducing H2S generation and inhibiting peritumor angiogenesis.61 However, the fast catabolism and regulation of this toxic gas show a great challenge for real‐time detection within the tissues.74 As one of the most dangerous gases, the concentration of H2S within the air needs to be monitored as well.