Using substances as a "pain reliever" over time pushes the "pause button" on the growth/development of one's feelings, thoughts & behaviours. It has become normal for society to seek reward and an escape for when pain/discomfort arises. Instant gratification feels good doesn't it? Although the consequences in the long run are not worth it.
I agree with what Alastair has stated in the article: "Mental toughness and durability need practice like any other muscle or habit. If we are not exposed to them with relative frequency, then we have no hope whatsoever of overcoming them in the moment — whenever that moment comes".