smoking tobacco products can damage your eyes retina CoEHAR publishes the world's first study assessing the impact of modified-risk on eye health How Smoking Affects Our Vision
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However, while nicotine does speed up bowel movements, it's not a traditional laxative

J Appl Physiol (1985)
It is also straightforward to assess with a single question with a yes/no response (i.e., Have you smoked at all, even a puff, since your quit day?)

And, you know, were very human

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There is a positive exposure-response effect to all such efforts 21 the more, the better