The majority of smokers I know are slim and trim. The non-smokers -not so much.
It would be interesting to see historical statistics for the average weight of adults (before smoking was discouraged) and present day statistics.
I am always amazed to see so many adults in stores and physicians’ offices who are 400lbs+ - all ages, races etc.,
I still smoke cigarettes but quit alcohol almost 30 years ago. When I got up at zero dark thirty today I stepped onto the bathroom scale and I weighed a half a pound more than I did when I got out of Navy boot camp in February of 1968.