Brom was particularly fond of Cardus weed throughout his stay in Carvahall and as well as his travels with Eragon. Before starting any conversation that would take time, he would pull out his pipe, fill it with Cardus weed and take a puff before proceeding forward. In Eldest King Orrin puffed on a pipe filled with Cardus weed in order to demonstrate that he could make smoke come out of his ear following an explosion. This unexpected action prompted a laugh from Lady Nasuada.