There’s very little information on chamomile’s effect on insomnia. A 2019 review of six small studies included only one study on insomnia. That one study found that chamomile had no benefit for insomnia. The same 2019 review looked at five studies on chamomile’s effect in non-insomnia populations. The review concluded that chamomile might help improve the individual component of sleep quality over a 4-week period in people without insomnia.
Nicotine is unusual in comparison to most drugs, as its profile changes from stimulant to sedative with increasing dosages, a phenomenon known as "Nesbitt's paradox" after the doctor who first described it in 1969
So if you know with 100% certain you're about to be tortured for 5 minutes, not a bad idea to get hammered. But if they wait til you sober up a little then torture you, it'll be worse.
However, because the vast majority of COVID-19 cases do not require hospitalization, many more cases of long COVID have arisen from these milder cases despite their lower risk.