Based on measurements done under laboratory conditions we have studied the variability of the extinction coefficient and angular characteristics of light scattering by smokes from burnt hydrocarbon fuels (wood, turf, coal, oil, and others), depending on the regimes of burning (pyrolysis, combustion), controlled by air humidity variations and heating of smoke particles. Peculiar feature characteristic of many smokes has been revealed that means that the light absorption ability of smokes (soot content) depends on the regime of burning. For example, the smokes produced due to combustion are strongly absorbing, while the pyrolysis smokes are referred to the group of weakly absorbing media. It is also shown in this paper that the smoke generation regimes strongly affect the condensation activity of smoke aerosols.