CB1R has been found to be linked to multiple pathologic processes in fibrosis, including pulmonary fibrosis (Garcia-Gonzalez et al., 2009; Marquart et al., 2010; Lazzerini et al., 2012; Bronova et al., 2015; Lecru et al., 2015; Chiurchiù et al., 2016; Cinar et al., 2017; Correia-Sá et al., 2020a; Correia-Sá et al., 2020b), but the actual function of CB1R activation in pulmonary fibrosis remains controversial. Here, CNR1 is linked to fibrosis.