How does smoking marijuana affect willingness to work? canadian researchers persuaded young adult men who used marijuana to live for 98 days in a planned environment. the men earned money by weaving belts. they used their earnings to pay for meals and other consumption and could keep any money left over. one group smoked two potent marijuana cigarettes every evening. the other group smoked two weak marijuana cigarettes. all subjects could buy more cigarettes but were given strong or weak cigarettes depending on their group. did the weak and strong groups differ in work output and earnings?