Not at all.
As someone else mentioned, in modern day use it's basically either a scheduled or announced time that either grants or denies permission to smoke. For example, during a fuel transfer "The Smoking Lamp is Out throughout the Ship" would be announced. When the fuel transfer was complete, "The Smoking Lamp is Lit in All Authorized Spaces" would be announced.
Historically, there actually used to be a literal "smoking lamp". When Sailors first started smoking aboard ships matches weren't a common item, so a lamp would be lit topside during times that smoking was authorized and Sailors used the lamp to light up. If the smoking lamp was out for any reason, no smoking... and when the smoking lamp was lit again, word would spread to let the Sailors know. Also, since old ships were made of wood and warships carried gunpowder, you didn't want folks running around with lit smokes so the smoking lamp also often served to identify the authorized smoking area - usually topside and near the galley where an accidental fire could be more easily put out.