Our study found a staggering 30.13% clone ratio among 33,073 Ethereum smart contracts. Discover the risks and implications for code quality and security in blockchain platforms.<p>Key Points:<p>Immutable smart contracts face code quality and security threats.<p>30.13% clone ratio uncovered among Ethereum smart contracts.<p>Exact duplicates account for 27.03% of clones.<p>Improve code reuse mechanisms for more secure and efficient smart contract development.