According to Chinese medicine, you shouldn't drink icy cold things pretty much ever, but they're especially bad for you in winter. I am enough of a Westerner that I quite enjoy a nice cola with lots of ice and a wedge of lime, and one reason I am anxious for it to warm up is because I am tired of not indulging in said beverage. I am a big ol' cheapskate and I can't stand paying a lot of money to burn up fossil fuels to heat my house to 70 F, so I keep the thermostat at around 65 F during the day and just wear lots of clothes. This saves on heating bills but means the only way I can drink an icy cola without darn near freezing to death is if I drink it in while I'm lying in a very warm bath, which I do from time to time, but only if I take a bath early in the day, because I don't like drinking caffeine after, say, 5 p.m.
Actually I try to avoid caffeine as much as possible. I only drink decaffeinated tea and coffee. Many people find this odd but I just don't like stimulants. Revving up is not what my personality generally needs.
My cola is preference is Coke, the real thing, but I find Diet Coke with Splenda a thoroughly acceptable substitute for the real thing. I remember when Diet Coke was invented: it was 1982 and I was a sophomore in college, and I thought dc was the best thing EVER! I drank a lot of it, for years, and then I quit for even more years because I didn't want to drink artificial sweeteners anymore. I do that with beverages; I give them up for a while. I didn't drink hot Dr Pepper at all in the 1980s, and then I started again around 1993; I didn't drink tea for a while but now I drink it a lot; currently, I'm trying to drink less coffee. That would be easier to do if I could drink Diet Coke instead, which I started drinking again last fall after I heard about this Splenda stuff, which supposedly isn't so bad for you and tastes more like real sugar. I don't know about how healthy it is, but I do know it tastes better, and that somehow helps me believe it's not as deadly as that aspartame stuff.