Yes, it is, along with bicycle riding, playing darts, and a million other things one might choose to do.
Seriously, though, you need to understand what tyranny is to understand that banning smoking altogether (something I do not support) would be far from it.
I seriously can't believe that you began that sentence with "seriously".
It is? Wow. I must have missed that. Until smoking is either classified as a private and individual act (which it, in public, is not) or smokers are classified as a protected group, there is actually no constitutional right to smoke.
Seriously.