Not a sub guy, but it doesn’t seem like an issue to me. The only time we banned carrying lighters on surface ships was when we were moving ammo and even that wasn’t really unnecessary with modern ammo. It wasn’t like we were moving bags of black powder.
I was in a Pershing Missile firing battalion, and matches and cigarette lighters were not allowed near missiles “on status”, ready for launch. I’ve worked as a subcontractor in Newport News shipyard, and we weren’t allow to have laser pointers or lighters. (Safety ran the shipyard.)
I really cannot see the down side to banning cigarette lighter in the shipyard.