Congratulations on your new friend.
First of all - did you ask what kind of routine they were using? How often they were misting each day? Did they have a drip system too? What kind of basking lights did they use?
In case they had a less-than-desirable routine, it is not always wise to immediately change the chameleon's routine - especially to such a "wet" one. The temperature changes and humidity increase could give him an upper repiratory infection (URI) - a cold!
Veiled don't need to get misted every hour - guaranteed! We mist 3 times a day - with 2 sessions of the drip (1 cup of water that drips down on a leaf). This follows the misting.
With the live plants - this should be sufficient for humidity - unless you live in the desert and have hot dry winds. 
Sitting under the basking light is a common thing for veiled males - the open mouth is a means of thermoregulating their temperature. Yes, they yawn - but it is different than gaping.
Be sure the temp where he sits does not exceed the temperature range for their basking area (no higher than 90F is really needed - some say 95). If the ambient temperature in the room is comfortably warm (75-80F) then a less hot basking area is needed. In the winter - if temps get down to 60 at night, then a warmer basking temp warms them up faster in the mornings We use a digital thermometer (Radio Shack) to measure this.
Be careful you don't over do...
Morgana - Reptayls, Ltd.
>>Hi,
>>
>> I just got a 10 month old male veiled chameleon yesturday and i have some questions for someone to answer! Today he has been under his basking light and has been gaping his mouth wide open and i wanted to know if this is normal? Do chamelons yahn? Also i got one of those zoo med habba mist systems and i have it set to spray every hour for 15 seconds. Every time the misters come on i wait to see if he drinks the water off the 2 ficus trees in his enclosure but he never does? His eyes are very bulged out so i dont think he is dehydrated. Thanks to whoever replies!!!