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Although current smokers had a higher risk of death than former smokers, former smokers still had an elevated risk of heart disease more than 20 years after they had kicked the habit, according to the study

Arabs talked a lot about unity, socialism and nationalism, but in reality they were deeply disunited

Most countries impose tobacco import limits between 200-400 cigarettes for personal use

(Image: SV / Alamy) So much in Sin City has changed even since my first visit 10 years ago

Future studies should consider conducting diagnostic tests such as the Durbin-Watson test for autocorrelation and the use of leverage statistics for detecting influential outliers