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HAlr: Writing review & editing, Formal analysis, Data curation, Methodology, Conceptualization, Validation

In terms of quitting, these cant provide the same information we get from randomized controlled trials, but they contribute further information on the side-effects of using electronic cigarettes to quit smoking

Carnivals official smoking policy reads as follows: Carnival Cruise Line is dedicated to the safety of all guests and crew

Mice were exposed to room air or CS for 1 h, twice a day (4 h apart) on days 21 to 28

If excluded states are systematically different from included ones, the counterfactual may be biased