I came through the Dublin Airport two weeks ago and they were interrogating a passenger with too many cigarettes there, too. Alcohol and cigarettes seem to be two of those areas you really need to research the rules on.
At HKG:
Tobacco
A passenger aged 18 or above is allowed to bring into Hong Kong, for his own use, the following quantity of tobacco products exempted from duty:
19 cigarettes; or
1 cigar or 25 grams of cigars; or
25 grams of other manufactured tobacco.
Alcoholic Liquor
A passenger aged 18 or above is allowed to bring into Hong Kong, for his own use, 1 litre of alcoholic liquor with an alcoholic strength above 30% by volume measured at a temperature of 20℃ exempted from duty.
If the passenger holds a Hong Kong Identity Card, he must have spent 24 hours or longer outside Hong Kong.
http://www.customs.gov.hk/en/passeng...ree/index.html