French nuclear attack submarine surfaces at Halifax, Nova Scotia, after Trump threatens to annex Canada (March 10)

It's a French sub though so it probably only fires gag missiles that just have a white flag on a stick at the tip.

Jokes aside can you smoke on a sub? Cause I know a lot of the French still habitually smoke cigarettes and I imagine that would do a number on the oxygen system. Let alone the dangers of possibly setting fires in a pressurized container deep underwater.