Nothing wrong with sparking one up once in awhile. But never on the job, especially driving a tank.
Might I suggest a nice sticky ‘Purple Hindu’ during your next evening break. Slow come up (even for the novice), long peak high and easy way down, mild psychedelic effects, beautiful mood, uncontrollable laughter if watching a comedy on TV, movie Hot Rod is a good one.
Wake up the next morning feeling physically and mentally wonderful, ready to hop in a MBT and take over the world. Lol