Yes - it is important that your physicians know of ALL your medical conditions, habits etc.
Smoking (ANYTHING) can increase the risk of complications related to surgery - since it can influence lung function.
I would definitely stop the smoking (tobacco and/or marijuana) prior to surgery AND let your doctor know and let the decision up to him if he wants to delay the surgery. I think if he stopped now, there probably would not be a problem - but that is best answered by the surgeon who is responsible for his care.
Here is a review article on illict drugs and anesthesia
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=Abstract&list_uids=10504905&query_hl=2&itool=pubmed_docsum
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