Сближения

[iad58]

ирландск. toitín ‘дымок; сигарета’ < toit ‘дым’ + -ín ‘-ок’
турецк. tütün ‘табак’ < tüt- ‘дымить(ся)’

Comments

[bangor-flying.livejournal.com]

Чисто навскидку - оно вроде бы есть и в бретонском. "Early German and Portuguese accounts of Brazil also record another name for tobacco, bittin or betum, evidently a native word in South America, which made its way into 17c. Spanish, French, and English as petun, petumin, etc., and which is preserved in petunia and butun, the Breton word for "tobacco." "