However, if you gamble every couple of weeks, I don’t think it will be harmful. The main thing is not to do this constantly, because habits are formed precisely because of consistency.
The most important thing to control about gambling is the amount of money used for gambling in relation to the total funds of the gambler. This is more important than controlling how frequent gambling is made. If the amount used for gambling is very small and insignificant relative to the gambler's financial status such that he can afford to lose it without pain, then gambling will never be a painful thing for him. Gambling can be a hobby but it is dangerous to make gambling a hobby because there is a thin line between hobby and addiction.