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1 (In recent years) smoking has received a lot of bad publicity, and
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fewer British people (now) smoke. Many companies have banned
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smoking (from their offices). It is becoming less and less acceptable
[to smoke (in a public place)]. Smoking is (now) banned (on the
London Underground), (in cinemas and theaters and most buses), and
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there are special smokers' carriages (on trains). It is rude
<or bad
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manners> [to smoke (in someone's house) (without asking, "May I
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smoke (here)?")]
2 (On the other hand), (in some countries) it is bad manners [to eat
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(in the street)], but (in Britain) it is common (for people) [to have a
snack (while they are walking down the road), (especially at