I think gambling depends entirely on luck. There are some people who have a good attitude towards gambling. I don't have much experience. I think gambling can make a person rich in a short period of time. Similarly, a person can destroy everything in a short period of time. I think it is better to stay away from gambling. If someone plays it for fun then it is fine for him.
There is nothing that is 100% luck. Someone you could say that is lucky has some skills that gives him winnings. Even if gambling is to a largely due to lucky, like upto 70%, there is upto 30% which depends on skill and experience. That is why you hardly see a newbie hit a jackpot. So, if you don't know how to gamble, try sign up to sites that provides demo accounts, practice and get acquinted to it before deciding to try it out.
Maybe that isn't 100% luck, but one needs the luck above his skills to win big in gambling. Skills, strategies with good control and patience can bring small wins, but for big wins luck is always a must factor. Gamblers who are highly calculative and are into clear observation on the games will make good picks. Casino games need good bankroll to withstand while we're on a losing streak. 100% luck works well with lotteries.