Question

فروش سیگار در کشور انها ممنوع است.{ به انگلیسی چی میشه؟}

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Answer 1

Selling cigarettes is forbidden/banned in their country.

Selling tobacco is banned in their country.

To sell cigarettes/tobacco is banned in their country.

Webster's:

tobacco: 

3. manufactured products of tobacco (as cigars or cigarettes); also :  smoking as a practice.

http://www.merriam-webster.com/dictionary/tobacco

Answer 2

Cigarette trade is banned in their country.

Answer 3

Trading cigarettes / tobacco is illegal / is not allowed in their country.

+1 to Messrs. Hamzeluyi and Karimian