White Smoke

[Gulfislander]

I need some advice. I have a Niagra 31 with a GM20FC Yanmar engine and SD20 saildrive. There is only 350 hours on both. I recently replaced the 2 blade folding Volvo prop with a 3 blade Flex-o-fold. On the first trip I noticed that there is a continuous but small amount of white smoke at cruising rpm's. I spoke with the mechanic at our marina who told me that most boats smoke. This answer did not inspire much confidence so I am reaching out to the boating community for help. Should I be worried?? The book I have on diesel engines speaks about lack of compression, air in fuel lines and unburnt fuel. I cannot see it as an engine problem as it still runs as smoothly as before switching props. I am thinking it has to do with the pitch of the blade...which I have to confess that my understanding of is a bit weak. I had given the manufacturer all the specifications and they had assured me that they supplied other owners of Niagra 31's (same engine and saildrive) with the same prop. Should I be worried? Is their something wrong? Other than this I love this prop...help! Thanks ahead of time.