I know several people who smoke pot and have met more in my travels. I have yet determined the direction of causality (whether lazy or unmotivated people gravitate towards pot or pot causes laziness), but either can easily be argued to be true through 'scientific' studies.

One particular colleague/friend comes to mind. Has been using drugs extensively for years, and is not exactly in the best shape. He worked in the same position I worked at, and is now getting paid more than me working somewhere else. He has good morals and some semblance of ambition, but if you didn't know that about him you'd think he was a good-for-nothing layabout. He has several scars on his body from bar fights, and despite his values he has very different opinions on things that I typically attribute to 'the working poor'. I am going to argue that my inability to judge people negatively may contribute to my acceptance of potheads and layabout lazy asses, regardless. Who knows.