As NBC News reported, approximately 42 percent of adults in the country smoked in the 1960s.
The Centers for Disease Control reports just under 14% of Americans smoked previous year, making it the lowest level ever recorded.
"It shows that smoking is becoming more concentrated in places where access to smoking cessation help is very limited", researcher Matthew Carpenter at the Medical University of SC, who was not involved in the study, said in a statement.
However, large disparities remain, with people living in rural areas still far more likely to smoke than city-dwellers, said the latest CDC report.
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A half century ago, more than 40 per cent of adults smoked in the United States.
Even though that still totals to more than 30 million adult smokers in the US, the slight decrease shows a trend that fewer people are picking up or continuing the habit.
Experts suggest that the decline in smoking may stem from a better understanding that smoking is not good a person's health and the deadly diseases smoking can lead to. According to the recent CDC report, smoking among American teens is down to 9 percent.
Less credit is given to e-cigarettes, which have been marketed as a means to curb tobacco smoking but pose unknown health risks and attract more nonsmoking youths than adult smokers.
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He added that the smoking decline has resulted in millions of lives saved and saved billions of dollars in tobacco-related health care costs. The campaigns included cigarette taxes, smoking bans in public places as well as educational drives.
About 14 percent of adults aged 18 and over smoked cigarettes a year ago.
There was no new information for adult use of e-cigarettes and vaping products, but 2016 figures estimate that three percent of adults are using e-cigarettes.
While e-cigarettes have been promoted to help smokers quit smoking, the different flavors offered are often luring in youngsters into vaping.
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Teen smoking rates also declined.as smoking among high school students is down to nine percent which is also a new low.