I mean that should be rule number one. Gambling should always be done with a clear head. I'm not sure I've ever heard of a good news story of someone who consistently does drugs and then gambles while on them lol. Not saying a night at the casino after a couple drinks playing some low stakes gambling should be banned but its difficult to control if you have multiple addictions feeding off each other.
For sure there were instances that it turned out with a good outcome. Being under influence of alcohol perhaps won't determine your luck. No one has control of luck anyway. However, the advantage of being aware is to be in control of your bets in particular with numbers or amount of what you will wager. Even with times (if you had any experience) of overlooking the amount you are suppose to wager, there are regrets for sure so what more with whole betting session. Influence of such, could also push you or give you bigger confidence to continue betting even if you are already in loss. And if you happened to be in profit, you could be wanting for more due to that influence, and end up without anything but loss.
Firstly let me start by saying someone who does drugs is has a very high probability and likelihood he is also a gambling addict. One should know when and when most to gamble. As a responsible gambler you should always make sure to be in a right state of mind both emotionally, mentally and psychologically before attempting any kind of gambling activity. Like I always say gambling in a responsible manner all goes down to being disciplined which involves knowing the right time to do certain things.
When we are asleep or just getting awake, we are usually in a state of mental imbalance especially when we recently wake up. Due to this we can easily make wrong decisions.
Inconsistency as well with your decisions if you are not in yourself. Being aware means being preventive of what's worse to come in your gambling session or even career. It is not only substance which contributes on such act but also emotions. The idea as well of not enjoying your full gambling experience is what many gamblers are avoiding.