This album was released on December 3, 1965. This album includes a variety of styles like rock, soul, folk, etc. However the prominent sounds were the inclusion of sitar, fuzz bass, and harmonium. And indeed, the characteristic about this album was that during its recording, the group members were under the influence of marijuana, not throughout it all but in a good amount of occasions.
I believe that positive emotional content seems to be more effective because people don't like to hear other people whining about what they feel or what they been through. :)