White smoke from exhaust

Iv had this as well. Altho mine is slightly more alarming because it does not seem to go away 100%. Iv only had my truck since November 2010 so i dont have any summer months on it when its dry and hot, but I remember one night driving home, stuck in traffic for 2 hours. There was no vapor from any other car/truck on the freeway i could see except for mine. Worried me because I notice this often after my truck should be fully warmed up. I still notice it to this day slightly, but i have been checking my coolant and oil constantly, have noticed no change. Have 1 oil change on it, almost due for my 2nd. Iv put about 8k miles on the truck, its now at 71k, i bought it used at 63k.