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Will legal cannabis and smart scooters help transform the atmosphere that Angelenos breathe? Jane Wakefield reports from the Los Angeles on two hi-tech industries hoping citizens will breathe deeply.

Smart scooters have been taken up with alacrity in a city notorious for its traffic jams and smog, and public official Mike Gatto is a big fan. But not everyone is happy with users' lack of respect for the rules of the road.

Across town, at the clean-cut offices of marijuana app Eaze, Sheena Shiravi explains how getting high is becoming increasingly hi-tech.

(Picture: Airplane landing at Los Angeles Airport above a billboard advertising marijuana delivery service Eaze; Credit: Mario Tama/Getty Images)