Can Smoking Alter Pregnancy Test Results
If we would make forbidden all that science has deemed potentially destructive, well are lives would be a lot less interesting(or more depending on how one sees it) This may not answer all your points, but bear in mind that smoking is inherently dangerous, whereas some of the things you mention (e.g
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Benefits of Using a Cigarette Case Aside from being a fashionable accessory, cigarette cases also offer a few practical benefits for smokers

Excessive use causes insomnia, agitation and severe depression COCAINE: Physical and Mental Effects Sexual Effects: At low doses cocaine increases desire for sex and delay ejaculation As use continues sexual dysfunction occurs Aggression, violence & cocaethylene Increases aggression & violence by disrupting inhibitory and fright centers of the brain Cocathylene (metabolite when cocaine & alcohol is combined) induces greater agitation, euphoria and violence Can also induce cardiac conduction abnormalities COCAINE: Physical and Mental Effects Cardiovascular Effects Can damage circulatory system Raise blood pressure Cause stroke (bursting of blood vessels in brain) Cause heart damage Neonatal Effects: Transmitted within seconds to fetus Increases chances for miscarriage, stroke, SIDS, respiratory ailments, mental delays & other abnormalities Proper pre-natal and post natal treatment can hel cocaine babies COCAINE: Physical and Mental Effects Tolerance: To the euphoric effect can begin to develop after first injection or smoking session Withdrawal, Craving & relapse: Major effects include anhedonia, lack of energy and intense craving Typical cycle of compulsive use: Bingeing to crashing to detox to resolutions of abstinence or treatment and relapsing 2-4 weeks later

If they find something suspicious, the next step is to take a sample of tissue to check under a microscope