Answer: Dry and flaky lips are so fucking annoying and near impossible to avoid during these cold months. The only thing us girls can really do to prevent them it is to keep them moisturised at all times and, sorry to be the bearer of bad news, but using Vaseline alone won't help. Vaseline is great at locking in moisture, however I've never rated it for hydrating lips or injecting them with moisture. There are a million other lip oils or balms that are better, trust me.
My current favourite lip treatment - although on the pricey side - is the Zelens Lip Treatment Oil (£40.00 SpaceNK). This pout perfecter is formulated with shea butter, jojoba oil, cotton seed oil and argan oil - an impressive group of ingredients that deeply nourish and moisturise the lips. My lips were in a bad way when I first got my hands on this bad boy and, after only a few daily pre-bed applications, they were back to being soft and supple. It is, by far, one of the best lip oils I've used. However, if you're broke as fuck, you could always reach for an eye cream instead.
I would also recommend exfoliating the lips regularly, as this will remove dead skin cells and prevent flaking. I exfoliate my lips twice a week using the Lush Bubblegum Lip Scrub 25ml (£5.50 Lush / $9.95 Lush). This gorgeous smelling (and tasting!) scrub buffs away dirt and dead skin cells gently and effectively, whilst also moiturising the lips (thanks to its inclusion of organic jojoba oil). However, if you just can't spare the coins for a lip scrub, check out this DIY recipe!