Bhagavad Gita: Chapter 18, Verse 39

यदग्रे चानुबन्धे च सुखं मोहनमात्मन: |
निद्रालस्यप्रमादोत्थं तत्तामसमुदाहृतम् || 39||

yad agre chānubandhe cha sukhaṁ mohanam ātmanaḥ
nidrālasya-pramādotthaṁ tat tāmasam udāhṛitam

yatwhich; agrefrom beginning; chaand; anubandheto end; chaand; sukhamhappiness; mohanamillusory; ātmanaḥof the self; nidrāsleep; ālasyaindolence; pramādanegligence; utthamderived from; tatthat; tāmasamin the mode of ignorance; udāhṛitamis said to be


BG 18.39: That happiness which covers the nature of the self from beginning to end, and which is derived from sleep, indolence, and negligence, is said to be in the mode of ignorance.


Tāmasic happiness is of the lowest kind and is foolishness from beginning to end. It throws the soul into the darkness of ignorance. And yet, since there is a tiny experience of pleasure in it, people get addicted to it. That is why cigarette smokers find it difficult to break their habit, even while knowing fully well it is harming them. They are unable to reject the happiness they get from the addiction. Shree Krishna states that such pleasures—derived from sleep, laziness, and negligence—are in the mode of ignorance.