Do Internet vendors actually encourage people to break the law? Or to they simply offer a service of convenience re: a legal product?
"...encourage people to break the laws implying that its legal to do so..." That what is legal to do so? Buying tobacco products via the mail, phone, and/or internet? Purchasing goods from out of state?
Last but not least, whence came this rise of tribal and internet tobacco sales? What brought it about? What keeps it fueled? Why do otherwise law abiding use this service to purchase a perfectly legal service, when physically it would be much easier to simply buy it locally? Could it be people know why politically and why economically prices of tobacco products are what they are, and so will not pay those wildly distorted prices?
If they imply the purchaser won't be subject to taxes then yes, they are encouraging others. If on the other hand they warn purchasers they are still liable for their own states tax, then no they are not.
Last but not least, whence came this rise of tribal and internet tobacco sales? What brought it about? What keeps it fueled?
Self interest. Some people would rather pay less even if it means cheating. Cheating has been with us since civilization.