Here's a simple test to see if the switch is working. For seven days, keep your vape where you used to keep your cigarettes. When you crave a cigarette, take three slow puffs, then wait five minutes. If the craving fades, you're on the right track.

Keep a mental note of how many cigarettes you actually smoke. If by day seven you're down to half or less, you're making real progress. If not, bump up the nicotine strength one step and try again.

You'll also notice your sense of smell and taste shifting. That's normal, and it's a sign your body is adjusting. Don't panic if you cough a bit at first—that's your lungs clearing out, not a bad reaction.