The Cannabis World Congress and Business Exposition aims to educate those interested in joining or networking with the cannabis industry.
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Many gathered at the Los Angeles Convention Center to talk to lawyers, doctors and advocates about cannabis-based businesses.
Much of the talk also circulated around Proposition 64, which would make recreation marijuana legal in California.
The measure will be on the Nov. 8 ballot. Several advocates spoke in favor of the bill, including Montel Williams.
The former talk show host said he hoped people remembered those in need of marijuana for medical purposes.
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"I use this for medication, I suffer from neuropathic pain, spasticity, I suffer from night tremors, and inflammation," Williams said. "There are certain strains that are not being processed right now for medical purposes because everyone wants to get high. I don't need to get high, I need to live my everyday like you do and other people do."
Williams became a medical marijuana patient back in 1999 after being diagnosed with multiple sclerosis.
The expo runs through Saturday with a cannabis career fair ending the event in the afternoon.