TS, since you are getting married soon, now is the worst time to start cheonging. I can tell you it might change your mind towards going through with marriage
But remember when you cheong, the girl looks better and all but it's just a fantasy you paid for.
Actually unless there are problems with your wife-to-be you'll find that first few years of marriage will be blissful and you'll be too busy and satisfied enough at home and won't bother looking elsewhere. Perhaps after kids arrive and you're more stable in your life and income and wife is off-sex and you're getting older ... then you might find the reason to start cheonging.
Don't worry about stopping. Past a certain age eventually will stop !