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doi: 10.1136/gut.2003.021691

They release a steady, controlled amount of nicotine into the bloodstream throughout the day to help manage withdrawal symptoms by maintaining a steady nicotine level, which can reduce cravings and irritability

We found that many of the studies were at high risk of bias this was usually because the e-cigarette users under investigation were also current or previous tobacco smokers (or studies had not checked for this), making it hard to pick out the effects of the e-cigarettes alone the findings should be considered with this in mind

A pipe in Zeppelin respectively cigar shape

Considering how extreme last year was on so many levels, it's not hard to come up with theories why 2020 might have seen more people reaching for a cigarette, as nicotine can offer a quick hit of dopamine.