It took a while.
When I bought my first vape I wasn’t entirely convinced, so it sat for a good six months in a draw, I occasionally gave it a puff as I spent some quite some money.
Then one night I had run out of tobacco and everything was closed, I remembered the vape and picked it up, wasn’t entirely convinced but the day after instead of buying cigarettes I bought juice and that opened my eyes to the possibility. It took a good few months to understand my nicotine usage and needs.
Give or take I’d say seven, eight months. But i was a ridiculously heavy smoker averaging a packet of baccy every three days.