Yep -- this is how I use my vape, to reduce my overall MAOI intake. And I started smoking to begin with for the antidepressant effects (which it's surprisingly effective at).
Were I to switch to vaping alone, it would be far easier to quit, mainly because the nature of conditioning relating to a vaping habit (hitting my juul at my desk) is very distinct from cigarettes (going on the roof and having a smoke triggered by certain events). The latter is far more "attached" to specific event triggers and lasts a specific amount of time, while the former is a more "ambient" act with much less habituality attached.
Were I to switch to vaping alone, it would be far easier to quit, mainly because the nature of conditioning relating to a vaping habit (hitting my juul at my desk) is very distinct from cigarettes (going on the roof and having a smoke triggered by certain events). The latter is far more "attached" to specific event triggers and lasts a specific amount of time, while the former is a more "ambient" act with much less habituality attached.