I believe the answer is: <span>theatrical roles
Symbolic interractionist believe that the interraction that people made with each other will be always based on an 'assigned role' from our social hierarchy.
This assigned role would determine the things that we can and we cannot do in society, just like the roles that we see in theatre/</span>
The answer you are looking for her is Tobacco
Los Angeles is the most dense for sure.
San Francisco and Oakland are no too far behind.
In the picture to the right iron filings have been sprinkled around a bar magnet. The iron filings outline the magnetic field lines, making it visible. Magnetic fields all have a pair of "poles", from which "lines of force" or magnetic field lines appear to originate.