This topic has been covered several times on CI. Gambling, in it of itself, is not a sin. It can become sinful, however, if one gambles so much that he can no no longer support his family.
As ggreg correctly pointed out, gambling is not unlike alcohol; in moderation there is nothing wrong with it, but it it can became sinful in excess.
You may been technically correct Dolores. However, every friend
acquaintance, and family member went into gambling and in every
case corrupted himself and those around him. Such as getting rich
without working, finding a golden pot of treasure. Getting rich fast
through the lottery, and ending up losing every penny and red cent.
Families starving and being run out of their houses because the
gambling of one member has taken most of all the income.
When we say the act of contrition in confession, remember this part
"AVOID ALL OCCASIONS OF SIN" This is why, Dolores, gambling
is always a sin because it leads people into accepting sinful life styles.
Dolores, when you go to confession and after the Priest gives you
absolution, be conscience in reciting every phrase of the act of
contrition especially "avoiding all occasion of sin".
Dolores, please learn your Traditional Catholic Faith from a to z
and you will never say that Gambling is not ever a sin.
Good Day, Dolores. I hope you learn more of your Catholic Faith on
CI.