Beeboy, again thanks for your encouraging post last winter.
Yep, I used pine needles when young as they were readily and worked great in a bee smoker.
Very interesting that you don?t use lighter charcoal due to chemicals. Ace expressed concerns also about chemicals. I have to agree as the concerns are valid concerns.
However, pine needles contain turpentine and many other chemicals that don?t dissolve in water which tells me organic chemicals: Very likely some are carcinogenic. However pine needles are considered organic and safe by most folks.
Mention varroa treatment and all kinds of discussions of chemicals appear, some hostile. Lots of chemical companies deceived us, lied to us, even killed some of us so there is a general distrust of any substance with a Latin name, for good reason I might add. I don?t have the answer, Beeboy, I would keep using pine needles with out worry if I had pine. Don?t fear an unknown chemical, just don?t trust one.
Four years of chemistry and what is feared by me: anything that starts with trichloro.... or mercury or formaldehyde, or arsenic, or cyanide, the list goes on and on, Run, run run.
BTW, formaldehyde used to be in trace amounts in cold flu vaccines, don?t know if it still is.