Why? Atomizer is probably more accurate than vaporizer. What's produced is an aerosol, not a gas. Straight off the heat source, it may be vapor, but that quickly condenses into an aerosol. My understanding is that early e-cigs used an ultrasonic atomizer, where vapor would have never been produced.
Perhaps "nebulizer" would better than either, but that has drug connotations, which it behooves the industry to avoid.
Unless you're thinking of "atomization" as breaking molecular bonds, which is a less common, alternate meaning.
Are you a Doctor? Does your last name begin with a 'G'?
I think I might know you...