QWERTY, just to help you get some facts, from
http://www.erowid.org/plants/c...shtml
"One of the primary health issues with cannabis is the effect of smoke on the lungs. While the risks from long term cannabis smoking are not fully understood, it is assumed by most health professionals that inhaling smoke into the lungs over long periods of time carries increased risks of lung problems. For people with very sensitive lungs and those who are using cannabis as part of a treatment for serious disease, smoking cannabis can be difficult and hard on the body.
Acute effects can include wheezing, coughing, difficulty breathing, and increased mucus production leading to more coughing.
Medium term effects can include decreased lung capacity for exercise, increased respiratory and throat infections, and chronic coughs. Many people (especially asthmatics) experience so much wheezing and chest discomfort that it's not worth the effects. "
and from
http://www.losangeles.com/history/
"In the fall of 1542, Juan Rodriguez Cabrillo sailed along the Southern California coast and, as he approached what would become San Pedro Bay, took note of the palpable haze filling the Los Angeles basin. As a result of his observations, he aptly dubbed the area La Baia de los Fumos, the Bay of Fumes. Even in the earliest days of human settlement, the air of Los Angeles posed challenges to its inhabitants. The meteorological phenomenon known as inversion (hot air trapping cool air) has typified the Los Angeles basin since time immemorial, and if the hundreds of Gabrileno (or Tongva) campfires could generate enough particles to inspire Cabrillo's name for the region, industrialization would obviously pose a problem."