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"The perceptions of the harmfulness of smoking cannabis are decreasing, and people have not considered cannabis use dangerous to their health." In addition, she said, "smoking cannabis the predominant method of use may pose additional risks because particulate matter is inhaled." The number of people using marijuana has increased significantly in recent decades in the U.S., where its recreational use has been legalized in 24 states and the District of Columbia

Other visible reasons for concern surfaced

Researchers affiliated with universities and non-profit organizations say they plan to collect updated data to determine whether the impression of increased smoking bears out statistically once circumstances allow

Many felt the film's relatively sappy ending negated the slicker, darker tone of the book