It's a false equivalence though, as I see it.
Cancer isn't infectious, and randomly occurs in people. Preventing smoking may reduce one particular cancer, but will not wipe it out - it's impossible to prevent it occurring.
Covid is infectious. The spread can be constrained, and not doing so would let it spread pretty much throughout the population, hitting everyone, and no-one knows what the death total would be. 450 a day might be chickenfeed - and if it got to that point it would be far too late to act. Also by the time it hit that much, the NHS would be creaking with all the collateral damage that would cause.
Comparing the too is just illogical as they behave in completely different manners, and have completely different prevention methods. Covid is a killer virus which can be restricted, so you restrict it. Just as measles, TB, polio, etc, is vaccinated at expense to the country to prevent it spreading.
There IS inevitably a tipping point when the damage caused by Covid prevention matches the damage caused by letting Covid run through the population. Judging that point is beyond anyone here, and most importantly can only be guessed at because it requires extrapolation into the future - there will be multiple opinions, and no-one can know for certain which is right; all there is each person's opinion.