idk Cobra is mentally retarded enough that I think his brain is physically different enough that he isnt getting shakes. There are people who have had seizures from withdrawal, but never shakes and never even had a hangover. If you really are that mentally ill I can imagine your brain is different enough that that shit misses you or expresses in a different way.
I also think that since hes someone with nothing to do and just drinks all day, hes not drinking as much as you might think, hes just at a level of drunk nearing blackout but he never passes out. Like someone drinking 12 shots in 2 hours is gonna get drunk and then blackout and pass out, hes drinking like 14 shots mixed with a bunch of random shit, over like 8 hours; I think hes closer to a 'functional alcoholic' than the type of person or 20s-something that is hiding it regularly, then binging on top of that.
Also because he is drinking in such a metered way, I think hes probably unintentionally tapering off even if he doesnt plan to. Alcohol withdrawals are most dangerous around 48-72 hours after the last drink but hes not really going that long and hes not binging on hard liquor. Ive talked to people who admitted to drinking like 2L of rotgut a day at their worst, and he isnt drinking Burnetts so hes not that far gone.