different ways to use tobacco alternatives: smoking without tobacco makes sense Pipe Tobacco vs Rolling Tobacco:

Until recently, though, its been difficult to achieve the goal of completely separating vaping from tobacco because all e-liquids used naturally extracted nicotine

Reusable THC vape pens, on the other hand, have a rechargeable battery and a refillable cartridge or chamber

The research revealed common household plants are capable of absorbing airborne substances like benzene (may cause headache, dizziness, and nausea), trichloroethylene (a liver carcinogen), formaldehyde (may cause nausea, watery eyes, and wheezing), and toluene (may cause memory loss, loss of appetite, confusion, and nausea) through tiny openings in their leaves

Further investigation would be needed to determine cotinine thresholds for discriminating active and passive adolescent smokers