AITA For not sharing my weed with my friends who didn’t bring their weed?

Me and 5 other friends went camping for two nights. Before we left I told everyone that I would be bringing some weed with me and that the plan was to share it between us as a group, I asked for each of them to bring some weed too. All of them said they would bring some but on the day none of them brought any weed with them. They asked me if I had brought some and I said I did but they had to chip in for it. They said that they didn’t think I was serious about asking them to pay me for it. They didn’t have money for the weed so I said they couldn’t have it. They called me an asshole for not being willing to share my drug.