Why most people smoke cigarettes

Lesson of biology.
Subject of the lesson “the dangers of smoking".
A teacher tells why most people smoke cigarettes and makes theorem that, the diameter of cigarettes in size from approximately the same diameter breast nipples, so, people just remember the times when coming maternal breasts ...
On the back of desks dealt a rhetorical question:
And that sucked in childhood those who smoke cigars? !
The lesson was ripped off!