Smell depends on the strain and growing conditions, flowering cycle will produce more odours. Any thing below 68 degrees and most Kannabis plants will be affected by shock. Frost will kill a Kannabis plant.
Humidity between 30 and 35 is best to avoid mold issues, some strains will mold very easy other do not.

Check out the Strain and Genetic Guides from more then one source @

http://vsite.net/kanman/strainguide.html
KanMan Reviewed by KanMan on . The Smell of Ganja. when growing a plant, how much does it smell? And at what age does the plant begin to smell really bad. Whats the minimum temperature that weed survives in? Humidity? Filtered spring water (in the 5 gallon bottles) good enough water for the weed? Just thinking of starting something up, but not sure about alot of things. Thanks :) Rating: 5