Let's get serious. Is there a twin control study for smoking and lung cancer?
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Not quite. No new study cited since 1988. More must have died now, so more data needed.
But other studies: http://ije.oxfordjournals.org/content/25/3/554.short … https://www.cambridge.org/core/journals/amg-acta-geneticae-medicae-et-gemellologiae-twin-research/article/cigarette-smoking-as-a-cause-of-lung-cancer-and-coronary-heart-disease-a-study-of-smoking-discordant-twin-pairs/D03EB2C171E660BDF2116432ABDC7C8C … But no follow-up from the STR it seems.