It is patently ridiculous to say that breathing in Hong Kong is equivalent to smoking.
If this were the case then the life expectancy in HK would be dramatically lower than other first world countries (because 100% "smoke" compared to 20-30% elsewhere).
In fact, the life expectancy in HK is higher than that in the UK, Australia, US or Canada. (Source:
http://www.census.gov/ipc/www/idbprint.html )