Those aren't really comparable. Those conditions all can land you in the hospital but there is enormous variation from person to person in how long it takes for that happen. You make the decisions that lead to that condition and then sometime in the next ~60 years it gets you.

The effect is that these decisions result in a small increase in the steady state hospitalization levels. If obesity or smoking increases the effects of that increase on hospitalization will be spread out over decades giving plenty of time for hospital capacity to be adjusted to deal with it. (Same if obesity or smoking decreases--hospitals won't suddenly be laying off staff. Hospitalizations would fall over several years giving hospitals plenty of time to reduce capacity by simply not replacing as many workers who retire or change professions).

COVID-19 is bad for hospitals because it is short term. That's why in the US we are currently getting about 20x as many daily COVID-19 hospital admissions as we got cancer admissions before COVID-19 (that's for all cancers, not just lung cancer).