Doing this in a forest is unsafe and bad for the environment. Mineral oils are insecticides (I can’t post links apparently, but if you google this there are tons of websites confirming their effect on insects) and vaporising then in forests will kill insects and cause damage to the ecosystem. Just saying “these are propane based so be careful” isn’t good enough, if this becomes popular there will be forest fires. If you can’t afford to rent the proper equipment just get up early.