3 months after lipo /fat transfer I start to smoke marijuana. Can my cells die?

Thanks for the question. I suggest you should meet your Board Certified Surgeon to talk this situation. Because it's better to wait a couple of months, your operation area trying to get healed. Then after yes, you can do smoke and drink. I wish you all the best.

While most surgeons wouldn't support your use of marijuana, smoking it should not have any effect on your surgery at this point in time. Grafted fat that has survived three months is no longer fragile enough to be damaged by marijuana smoke. 

I doubt the marijuana smoking is causing decrease in transferred fat. I bet the expected %s of fat dissolving has occurred. Or the method of transfer was not done correctly.