What may be effective for you:
Try reading a thesaurus. Look up words you generally wouldn't look up (such as poisonous - my favorite example), and then find the other words which are given as similar definitions, noxious for example.
It's helpful for me, as I always remember my favorite ones, and it can be quite nice when you're in a peaceful mood, or if you're just sitting up in bed and can't sleep.
Nonsense. Whilst it may seem I'm proclaiming some sort of unique self worth here, I haven't read a proper book other than pages of interesting non-fiction for over six years, and I'd like to declare myself superior to the vast majority of other people my age.