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Smoking is allowed onboard Carnivals fleet in designated locations, so smaller amounts of cigarettes likely wouldnt ring too many alarm bells

Don't know how hard it will be to find a canonical source
Beard E, West R, Michie S, Brown J
Whats most effective is aerobic exercise, which is great because doing aerobic exercise will also give your body endorphins that will help curb cig cravings

Logistic regression analysis was performed to estimate adjusted odds ratios (AORs) and 95% confidence intervals (CIs) for the prevalence of alcohol dependence, as measured by AUDIT