The social perception of cannabis use in Spain is getting more tolerant among young people. This study aims to uncover the attitudes of university students toward cannabis and examine the differences in their attitudes according to their use status. We applied concept mapping, a mixed-methods approach. Participants were recruited from 12 universities. During the first stage, 5 focus groups were conducted with 56 participants to determine the ideas in the concept map. In the second stage, ideas were pile-sorted and rated by 140 participants (77% females; average age = 21.6). Hierarchical cluster analysis of the pile-sort data generated the cluster map. We used t-tests to explore differences in ratings by pastyear users and non-users (abstainers and ex-users). Participants generated 70 ideas associated with cannabis during the brainstorming sessions and categorized them into six groups: risks and harms, information, legalization, motives, tobacco and cannabis, and normalization. Users and non-users agree that cannabis has health risks and that smoking it mixed with tobacco is the main route of administration, although they do not perceive that this mode increases the hazards. Both users and non-users demand more information. However, they strongly disagree regarding the rest of the clusters. Users distinguish between sensible and problem use. They associate frequent use and coping motives with difficulties, whereas they perceive that moderate use yields pleasures and benefits. They blame the lack of legalization for the social stigma they still suffer. Non-users reject these considerations. Spanish university students believe that cannabis use is normal among young people. Non-users are tolerant of peers who use cannabis, but users feel stigmatized. There is a divide between the two groups regarding the convenience of implementing legal reforms.