Gambling is usually a compulsivity issue, not impulsive. If an act is planned with forethought, it's not impulsive.
Impulse control disorders (ICDs) are characterized by urges and behaviors that are excessive and/or harmful to oneself or others and cause significant impairment in social and occupational functioning, as well as legal and financial difficulties.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3089999/