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Cigarettes should be banned
Small cigarette stores will go out of business.
Maybe yes, but this is not a problem. Selling poison is immoral, so them losing a specific source of income is no to be seen as a worry. After all, we are not worried about the livelihoods of contract killers either.
As cigarettes are usually sold in convenient stores which have plenty of alternative wares, stores that primarily sell cigarettes are very rare and therefore do not make up a relevant part of any nation's economy.
It is natural for many businesses to become absolete as society rejects them or doesn't need them anymore. Employees and store owners of these businesses have to cope with a changing market and be re-habilitated to other more demanded job sectors.