David Crosby claims to have rolled more than 2.4 million joints, which pretty much makes him an expert in that department.
So of course fans would send photos of their own work to the Woodstock rocker, who is happy to play judge on Twitter.
While Crosby can come off like Gordon Ramsay in his criticisms of inferior techniques, he also praises when he comes across ones that meet his standards.
In case you're wondering where Crosby gets his inspiration, he once admitted, "All those songs you like, Crosby, Stills, Nash and Young, CSN, the Byrds, my new bands...I wrote them ALL on cannabis. Every one of them."