On the August 28 broadcast of 'Oppa Thoughts', Taeyang revealed he's not a heavy drinker and that he no longer drinks at all. 

Taeyang explained, "I don't know how much I can drink because I'm not a good drinker. I told Psy hyung, 'I don't know my limits. I've never been drunk', and he invited me to his house. When I got myself back together (after drinking), I realized that the two of us drank 8 bottles of wine. After then, I got sick of drinking. I struggled 2-3 days from a hangover."

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The idol also shared that he's not the type who gets red from drinking (Asian flush reaction).