Can I ask you a hypothetical question about your spouse using drugs?

I asked a question earlier about finding out my husband is using drugs. We have a young son, and I am in school and pretty much relying on him until I get out of school and it is just a rough situation. I confronted him on the phone, and he didn't deny it, but he just said "you don't know the whole situation and it isn't as often as you think, it is not a big deal" I found it in his truck. A gumball sized bag of what I have deduced by searching the net is crystal meth. It is not okay to me. I am not a drug user, and have never tried it. I love him and after 12 years I am hurt. I called an old friend of his who told me it has been going on for over 15 years. I know that my husband never sleeps, and yes he works super hard and makes a ton of money, but some of the answers I got were pretty much telling me that it is OKAY if he does it to "keep up with his job and our home" Why ? Why is doing drugs okay if you are still making money and holding down a job? Is the fact that he makes good money and provides for us a good reason for him to do drugs in order to work longer hours? His job is fun for him and not demanding and he loves it, so this excuse doesn't cut it for me. So my question to you is if your husband or wife uses drugs in order to provide a more than decent life for you, do you think that makes it okay? Why?