Chronic use of mild intoxicants subtly destabilizes mental balance, emotional control, and rational decision-making.

Original passage

Some who are never considered really drunk are always under the influence of mild intoxicants. They are feverish, unstable in mind, unbalanced. Imagining themselves secure, they go on and on, until every barrier is broken down, every principle sacrificed. The strongest resolutions are undermined, the highest considerations are not sufficient to keep the debased appetite under the control of reason.