I don't find drinking and gambling a safe way for gamblers because there is possibility of misbehaving that could cause us loses if carr is not taken. When gambling, we ought to concentrate very well on ways and strategy to follow so we can make money from ourselves without going too far. The possibility of making money will be always there and drinking while gambling is not a good ethics.
Gamblers and drinkers have different goals. If drinking habit was paid or rewarded with something, addiction comparison would go in different direction
Dont know about the rest, but for me stop drinking is much easier than stop gambling. I can easily go with 1 beer during whole party, switch to beverages and observe other get slowly drunk or funny
But, when everyone are gambling around, I can not place only one bet and become a spectator. Its so easy to not to drink by saying "I have to drive today, I need a clear mind" and nobody would even try to involve you into drinking. But with gambling, those who gamble will try to get you in the game by all methods