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"Companies that ultimately go on to have success … what they have understood is that while content is critical, distribution is king," Wehmeier said.

"Compared with traditional tobacco advertisements, such information, dressed up in readable personal stories, is more difficult to identify through regular online supervision channels," said Zeng Xiaopeng, deputy director of the Beijing CDC.

"Chinese tourists now have better jobs and know how to share information, especially those born in the 1980s and the 1990s (Millennials)," Chen said.

"Citing the Joint Declaration as a justification for irresponsible remarks and interference in Hong Kong affairs has no valid ground. This goes against not only 'one country, two systems', but also the basic norms governing international relations," he said.

"China was the first country to fully recover. Look at the GDP (gross domestic product) data in the third quarter in seasonally adjusted terms, it has already reached the pre-crisis levels," said the chief China economist at the Paris-based organization.