Gambling is particularly dangerous because you can get financial ruin extremely fast, compared to other addictions.
I don't think gambling addiction is the most dangerous compared to other addictions, as you said gambling addiction will make ruin your financial, that's all. Actually drugs addiction is way more dangerous than gambling addiction since it will ruin your financial and your health condition. If you lost all your money but you still have a good health and body, you can get a job. But when you don't have any money and you're sick due to drugs, it's almost difficult to get a job to make you survive.
That's a valid point. When comparing the addiction of gambling with drugs the latter has more weight due to the physical side effects of drugs on the body.
If our health is good we can still make money but if our health is not supporting us then it is very difficult to make money.
As they say, health is wealth. But ofcourse both the addictions are bad since they can both lead to death.