One of my best friends is merried to a coke addict.
He used to lie to her about it all the time. They had so many problems bc of that. At the end, she did manage to get him to stop. But it will never be really ok. She will always be suspicious about it, she will never be relaxed. They have 2 kids together and it is just too much stress for a girl to handle, that's my opinion.
There is no reason getting yourself into it. There are plenty of normal guys out there and you deserve more.