there's some research lining gambling to dopamine receptors and such. which types of gambling do you partake?
Here are some suggestions:
Sports betting -organised
Sports betting -amongst friends
Gaming (fruit) machines, video poker etc.
Casino games (inc. internet poker, roulette etc.)
Lottery tickets
Lottery syndicate
Scratch cards
Bingo -irl
Bingo -online
With friends. card/board games
With friends, bar games, pool, darts, shut the box...