I'm actually finding it hard to remember how yukky smoking made me feel unless I really concentrate on the feeling of deeply inhaling the toxic fumes .
Yeah, exactly. That's one of the major ways the addiction manifests, it makes you block out all those disgusting parts of the habit, and only focus on the nice bits. It does get easier to recall those negatives with practice though, and it can become a habitual response to those cravings in time, that helps to resist them. It also helps to try and recall some of the especially unpleasant experiences you've had while smoking, because those can be harder to forget.
It did take me a while to get the hang of myself. One thing that also helped, hopefully you won't have to use this one, but something to maybe keep in mind just in case, on the few occasions early on where my will would break and i'd smoke again, i'd make a point of memorising the whole experience as i was smoking. How much it was taxing my lungs. The unpleasant tingling in my lips. Standing there in the bitter cold instead of staying in my nice warm house, doing something better with my time.