They must be aware of this so that they are not too eager to gamble. After all, they are still beginners at gambling so they have a lot to learn. If they can stop themselves from wanting to gamble again, they will not become addicted.
Gambling is just an activity that doesn't need to be done too often. We still have many other things we need to do. Don't let playing gambling make us addicted so it is difficult for us to quit gambling.
It is something that can only be learnt by experiencing it because the feelings, good or bad sometimes, that are experienced by the gambling player are quite unique and these do not affect everyone in the same way. A social gambler is something completely different from a pro Poker player. The average gambler does not exist, so the only advice is to make sure you start with small bets before going big.
Beginners should learn how to use gambling as entertainment. Otherwise, he would only get deeper into gambling without being able to get out easily. He needs to learn to control himself so he doesn't get addicted to gambling.
By always controlling himself, he will be able to use gambling as entertainment. He also won't be addicted to gambling because he can divide his time between gambling and other things.