What is picking up cigarette butts?

An activity homeless people are usually seen doing in carparks or in town as a source of tobacco.

I was in town and observed a person of no fixed address picking up cigarette butts, they then broke these up, discarded the filter and paper, then placed the tobacco in a tobacco bag. I later saw this person rolling up cigarettes from this source of scavenged tobacco.

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picking up cigarette butts - video