Orangeman,

I'm sorry to hear about your bad times brother. Life is really strange, sometimes you're up and pulling ahead, and others you're down and falling behind. I can understand how you're feeling because i've felt that way too. I have been smoking everyday now for damn near 2 1/2 solid years and I definately know exactly what your talking about when you say that you're feeling lost and life is pointless.
Recently i tried cutting down to only smoking at night time. This helped me deal with life during the day and have something to look forward to at night (nothing like smokin a joint). This was a good way for me to not always be high and trying to deal with real life.
If you feel like quitting is a good idea then that is the best idea for you.
Remember at the end of the day, the only thing that makes the difference in you're life is if you're happy or not.
Hope your mom feels better.
Peace