I did it for the entertainment & group inclusion(poker). I justified it as I didn't lose $200, I paid for several(sometimes many) hours of entertainment. Then one time I ran out of time while I was up several hundred. The next time was again time constrained and I walked w/ $700.* The last time I met an old friend I haen't sen in 15 years and we blew our cash on drinks talking about old times. I figure I'll never be this close to even ever again so I haven't played again in 9 years.
*I'm still way behind, but figure the odds of recouping more are stacked against me.
That, in and of itself isn't bad, nothing wrong with always picking gambling when you have some free time and money.
With addiction, of any kind, it kind of creeps past the point of free time and money. Preferring X over sleep, work, food, whatever other things are important is where it gets pretty rough for people.
So anyway, yeah, there's an element of personal choice. When the biases get so strong, it's hard to recognize that a choice is even being made. People don't exactly choose to brush their teeth in the morning, it's just something that happens as part of the morning routine. It's technically a choice, but the bias is so strong, people rarely consider not brushing their teeth. (as a somewhat silly example)
* More so than just getting a lot, I was missing work, foregoing important events and losing sleep to engage with any woman who gave me permission. Aging & perpetual lack of funds cured that one for me, although it is always on my mind. I can not credit that to any personal strength.
edit:reword last sentences and fix *s
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