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The world organization  recedntly reported that the number of cases of tuberculosis has been falling since 2006, also, people are dying from tb, but a study by researches at the university of cainifornia san francisco says smoking could threaten this progress.
Nearly twenty percent of all people use tobacco and millions of non-smokers get sick from breathing the smoke. the new study predicts that smoking will produce an additional thirty four million tb deaths by 2050
Effects to control the sperad of tuberculosis have mainly foucsed on finding and trading infections, much less has been made to understand the causes. Doctor ?? is the directer of the united states national institute allergy and infectious diseases.