Why do you think that? A cigarette contains 10-20 mg of nicotine depending on the tobacco blend used. The strongest e-liquid is 50-60 g/l so to get 10x nicotine of a mild cigarette you'd need to atomize 2ml of the strongest e-liquid. Coincidently, 2ml is the legal limit of disposable vapes in EU. So, to get nicotine of one pack (20) light cigarettes you'd need to empty two European vapes (provided they are filled with the strongest liquid and at the capacity cap). To get 10x nicotine of a pack-a-day smoker you need to vape 20 disposables a day, which seems like quite a feat to me both physically and financially.

A cigarette contains 10-20mg, but it's not readily available. On average, of those 10-20mg, you absorb only 1mg. [1]

My assumption, which could be faulty, is a lot more of the nicotine in the vape gets absorbed vs a cigarette.

[1] https://www.medicalnewstoday.com/articles/how-much-nicotine-...