Cannabis has various mental and physical effects, including increased heart rate, difficulty breathing, nausea, and behavioral problems in children whose mothers used cannabis during pregnancy. Long-term adverse effects may include addiction, decreased mental ability in those who started regular use as adolescents, chronic coughing, susceptibility to respiratory infections, and cannabinoid hyperemesis syndrome.
See also: Deepwater Horizon oil spill, Incense, Looney Tunes and Merrie Melodies filmography (1940–1949), Smog, Blue-black grassquit, and Oil shale in Estonia.