Navy -- novocaine is a dental anaesthetic. Not abusable unless by local injection. Not a junkey's drug. I am sorry for your experience. But nevertheless you are correct here. The biggest abuse in the USA in this context is 'laughing gas' i.e. nitrous oxide -- I nearly died with a USA dentist. No chance in the UK.
Novacaine however, is not used for recreation, it was made for numbing pain. Could you abuse novacaine? I really don't know unless you like being forced to lay around.
Scare tactics and making them illegal doesn't stop people from doing them though, so...
A lot of people refrain from doing them because they are illegal, so....
*the exceptional businesses of our esteemed moderators