I've always smoked the HCl salt and had a dose/response curve bang in line with the one quoted on Erowid for the smoked freebase. I then learnt how to convert HCl to freebase and did a benchmark test with equivalent doses of each (though washing up the HCl to freebase gives a marKed reduction in volume). I found the effects to be identical. My conclusions therefore are:
1. Smoking the HCl is every bit as effective as smoking the freebase for an equivalent weight.
2. The HCl produces much more smoke and it's pretty acrid. This leads some people to not inhale or hold the smoke properly, giving a diminished effect, leading to the conclusion that, for them,smoking the HCl does not work so well.
3. For high doses (>50mg) the HCl produces so much acrid smoke that the freebase is probably a better option (though I've smoked 70mg of the HCl successfully)