The most common and most likely answer to this crossword clue is the 6 letter word VAPING
I've seen this crossword clue in Financial Times
V
A
P
I
N
G
Buddy explains!
The straight part
We know that "One way to kick the habit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one way to kick the habit = vaping.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does VAPING mean?
VAPING verb- To inhale the vapor produced by a non-combustible cigarette, most commonly an electronic cigarette.
- The action of the verb to vape; the use of an e-cigarette.