Hi,
Take a look at the following dialogue, please.
A - Today’s my lucky day. Let’s buy a lottery ticket.
B - Wait a minute! Are you sure you really want to?
A - I don’t understand. What do you mean?
B - If we won the jackpot, I could become an alcoholic and I could lose my job.
A - How awful! OK, let’s not buy a lottery ticket after all.
About the last sentence, could I say “OK, let’s not buy a lottery ticket finally/at last” as well?
No, neither of those alternatives carry the correct meaning.
Hi Bev,
OK, I can’t say that I wasn’t expecting this “no”. By the way, instead of “I could become an alcoholic etc.” could I use “may” (or “might”, of course) as well? Thanks again. Take care. 
Yes, those are all possible.
Beeesneees,
Is this sentence correct?
“Anyone can become an alcoholic if he has an alcoholic parent, uncle or friends.”
Grammatically it is. Logically it isn’t.