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Scientists are [warning / warming] that people who smoke are [on / in] danger of damaging their eyes. The scientists say smokers are [two / twice] times more likely to lose their [visionary / vision] than non-smokers. Everyone knows that smoking can damage the [lungs / lung] and heart, but not many people know it could damage the eyesight. The [sciences / scientists] are from the Association of Optometrists (AOP) in the United Kingdom. The AOP has started a campaign to [rise / raise] awareness of the danger of smoking to the eyes. The campaign is called "Stub it out". The word "stub" [means / meaning] put out a cigarette by pushing the end [against / for] something hard; "stub it out" is saying, "stop smoking". The AOP said only [once / one] in five people thinks smoking can damage the eyes.

The AOP explained why smoking is so [harmed / harmful] to the eyes. Cigarette smoke gets in the eyes and causes or [worsens / worsen] a number of different eye problems. Cigarette smoke [contents / contains] toxic chemicals that can [irritate / irrigate] and damage the eyes. Smoke contains tiny pieces of metals [such / like] lead and copper. These can get into the eyes and lead to [contracts / cataracts] - a condition that causes the eye lens to become [cloudy / crowded] . People with cataracts usually need an operation to [store / restore] their sight. Smoke can also increase the chance of worsening [sight / slight] problems for people with diabetes. The AOP said smokers are also three times more likely to damage the eyes' muscles. The AOP has encouraged smokers to [quite / quit] .