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I have never felt that gambling is affecting me negetively, that's because I try to gamble responsibly and to not see it as a means to generate wealth, rather whatever money I make from gambling is a bonus for me. That does not mean that I have not lost huge amount of money to gambling, because even when you gamble responsibly, you still tend to still take risk sometimes and you end up regretting when you lose. In such situations I talk to myself and try not to make the same mistake next time.
I totally understand why people get addicted to gambling; that's because they want to make money and they always think they can get it right the next round, that's when you need to caution yourself, so you don't get addicted.
That's how it should be; everyone should gamble responsibly. The negative impacts of gambling are essentially caused by addiction. They can't sit still without gambling and may even lose sleep because they constantly think about gambling. The thought of a big win from a particular game drives them to continue gambling, a negative impact experienced by many gamblers.
There are certainly many worse impact, but when gamblers gamble responsibly, it's still possible to avoid the extreme imapct of gambling. Anyone who gambles repeatedly is certainly addicted, even if they don't gamble for money. The negative impact are relatively low, as they don't fully expect to make a lot of money from gambling.