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Because the dose is so small and insignificant looking, there is a tendency for people to think they need more than what they are told is a safe dose. Another problem is that the technique of vaporizing and inhaling the compound can be a bit tricky. Salvinorin A has a relatively high boiling point and people often don't get it hot enough to remain a gas all the way down into the lungs. Another problem is that so little is used that the vapor often disperses before it gets inhaled. Sometimes people just don't hold the vapor in their lungs long enough for thorough absorption. Several people after trying a dose in the recommended safe range and not getting an effect assumed that they needed a larger dose, when in fact the problem was that they did not vaporize the material efficiently the first time. I have already seen more than one intelligent, careful and experienced person accidentally do too large a dose because of this. Fortunately they had sitters and managed to get through the experience safely.