I argue against pine and soft woods being 100% safe to use. While kiln drying is effective in removing most of the tars, phenols and oils, the quality varies from manufacturer to manufacturer, so choose a good brand.
I know most people get a head ache when I drop in pine convo's, but I think it's important to let people know that there is still residue left, and it varies from one brand to the next.
I recommend shopping for a bedding that doesn't have strong odor, isn't very dusty, and is light and fluffy. Apply that to both pine or aspen shavings.
It can be argued that no degree of kiln drying is effective in removing ALL of the harmful chemicals, but a good quality pine is better than a bag of raw wet thick shavings, in my opinion.
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