If it’s a backwoods cannabis grower with no cares in the world for cross contamination, you can’t be sure
I have had sensitive lungs my entire life from asthma. My pediatrician recommended an inhaler when I was eight years old and from then on I had to keep it with me at all times. It saved me from an asthma attack once when a cleaning chemical being used at school in a classroom made me start to choke. As much as I hated always being that one awkward kid with an inhaler in his hands during recess, I’d rather be alive and ridiculed than dead. And as time went on, I got slightly better at avoiding potential respiratory triggers. Even if that meant giving up the chance to play team sports as a kid. I always wanted to be a professional soccer player so those dreams were squashed right out the gate. Some of the worst respiratory triggers are cleaning chemicals. Solvents of any kind are enough to make me feel like I’m going to have an asthma attack. Imagine how I feel about vaping cannabis oils that are made with chemical solvents like ethanol and butane. I have been told by people in the cannabis extraction community that there aren’t residual solvents left after purging, but that depends on the skill level and quality control standards of the team doing it. If it’s a backwoods cannabis grower with no cares in the world for cross contamination, you can’t be sure. Even at tiny parts per million, I don’t want to be heating these solvents and inhaling them regularly. I prefer solventless cannabis concentrates like hash rosin instead of butane hash oil.