Can someone still develop the habit of gambling and become an addict even though no one around gambles?
Trough online casino, man. The answer is easy. And this what happened during Covid lockdown in 2020! Or do you also want to cut down a person from the Internet? Some kind of nazi tactic

I agree that self-will plus environmental effect will greatly help in the treatment of a gambling addict. Being in a vicinity where gambling isn't accessible will force the gambling addict to stop engaging in gambling activities and thus will not feed his urge to gamble. The prolonged effect of not having access to gambling activities may force the person to change hobby and possibly forget about gambling.
aha, the same as with a junkie (sarcasm). There is one big problem: addicted people are often fall under heavy
drug withdrawal. Gambling is in fact the same drug as jet or amphetamines.