if the butane is not properly removed or you use low quality butane then yes it can be unhealthy. not all mmj patients get full relief from the "natural herb" alone and require a more concentrated form to smoke or vape. most of those (in colorado) prefer bho over solvent-less water hash and few use co2 oil for anything other than eating.
i'm not a fan of co2 oil due to the loss of terpenes. i think they are now starting to get better but those systems are not cheap and are more for large industrial applications. if you are ingesting medical cannabis in edible form then yes co2 oil , coconut oil and ethanol/everclear grain alcohol or 200 proof anhydrous ethyl alcohol are all fine.
Dab Panel at the High Times Medical Cannabis Cup - Denver 2012
See: Dr. Bob's intro @ 9:00
Official Daily Paul BTC address: 16oZXSGAcDrSbZeBnSu84w5UWwbLtZsBms
My ฿itcoin: 17khsA7MvBJAGAPkhrFJdQZPYKgxAeXkBY
Want DP delivered to your inbox daily? Subscribe here: