Cavazos-Rehg says messages on Twitter and other social media outlets likely influence behavior and public opinion.

7000 influential marijuana-related tweets over a period of one month were randomly selected to assess the sentiment and themes.
Demographics of the users tweeting about marijuana were inferred using a social media analytics company.
Marijuana Twitter chatter sent by influential Twitter users tends to be pro-marijuana and popular among African-Americans.
Most marijuana-related tweets reflected a positive sentiment toward marijuana use, with pro-marijuana tweets outnumbering anti-marijuana tweets.
The most common theme of pro-marijuana tweets included the Tweeter stating that he/she wants/plans to use marijuana, followed by tweeting about frequent/heavy/or regular marijuana use, and that marijuana has health benefits and/or should be legalized.
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