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You could potentially get cancer from 1 cigarette but it wouldn't be the cigarette that would cause you to get cancer, you would have gotten the cancer regardless of that 1 cigarette. However, it's highly highly unlikely you'd be getting lung cancer or any type of cancer in your early 20's, a little more likely from there in your 30's, more so during 40's and then likely around the 50's and 60's. Cancer is caused by mutant strains caused by imperfect DNA replication and repair if I remember correctly from bio..smoking does increase the chance but I don't think you'd get cancer if you're young, especially since it takes a long time for cancer to actually develop
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