Before you say anything, you need figure out what "You" want and are willing to hold your ground on. If she drinks and smokes...will you say AND follow through with ...it is over?
If that is what you want and where you place your boundary...you need to hold true to your word. If not ready to go that far into things...don't say it if you won't do it.
What could be said... Well you know what happened last time... this is my wish but I understand you will do as you want.
It needs be her choice. Attempting to force her to do what you want will possibly have her feel you are controling and that will lead to other problems.
Share your wishes or set your boundaries but know that the choices must be her's no matter what.