> Choosing to enjoy life today instead of waiting for tomorrow for that enjoyment isn't a failure, it's a choice.
This conveniently papers over a critical mechanism of how biological brains operate: we do not choose 99% of our actions. It would be extremely inefficient and energy-consuming.
99% of our life we are on autopilot, driven by our habits engaged as response to sensory and internal stimuli.
Habits explain neatly concepts like addiction, while the choice story applied to concepts like addiction or self-destructive acts is reductive at best, and catastrophic on a societal level. Yet the majority of people, those that have been lucky not to have yet felt the grip of addiction, tend to have this opinion that addicts are just weak-willed idiots. This is not referred to you in particular, I am generalising based on common and frustrating opinions about addiction and recovery by well-meaning, but ignorant people.
Functionally and neurologically, there is no difference between a heroin addict and someone that has been going on a run every day for a decade. It's just that their autopilots have been trained to prefer a different action in response to similar stimuli, and brains respond and adapt much more readily to super-stimuli found in drugs and other destructive habits, than with natural and healthy "highs".
I recommend the book "The Biology of Desire" by Marc Lewis, an ex cocaine addict turned neuroscientist.