the disadvantage of playing mahjong

First,it takes people many hours to sit at the tables.Sometimes people will forget the time and won't stop to have a rest.It does harm to one's health.
Second,it costs people lots of money.Even a person has lots of money,he still wants to play mahjong to get the money back.It is called"gambling psychology ".And people won't care more about their family.

first waste of time
second will be indulged in gambling
thirdly be not good for one's health