"Tobacco is the only product sold to the general public that, when used as intended causes the death of the user"

"They do not cause permanent damage to the body...."

Uhh, dude, I'm jumping in here but, neither do cigarettes, IF, you only had one a week I'm sure you'd be pretty much ok. But if you take them over a long period of time several times per day they'll kill you..

Hamburgers, several times per day, over a long period, will also kill you (most likely via congestive heart failure)