If the injectors are worn/leaky they can cause more difficult starting/ rough running and smoke.
That being said the nozzles are probably better then what you can get from Bosch now.., I haven't been too thrilled with the made in India nozzles that Bosch now manufactures.
I have been trying different vendors/manufactures of injector nozzles. I have found a new outfit that sells performance nozzles Aka "GTD" nozzles. I have yet to run them or spray pattern test them but they seem to be of high quality more of the likes of the made in France Bosch stuff.
Can you post a video of cold start and running at operating temp?
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