Smoking creates these heated aerosol as well as gas that gets in the lungs. The bloodstream then absorbs the substances.
Yea, the substance first gets into the lungs and then is rapidly absorbed into the bloodstream from there.
Smoking is sometimes exhilarating and relaxing although bad for your health. Yea, the smoke is actually absorbed into the bloodstream The nicotine is what is addicting. The bloodstream moves quickly.
In the case of cigarette smoking these substances are contained in a mixture of aerosol particles and gasses and include the pharmacologically active alkaloid nicotine; the vaporization creates heated aerosol and gas to form that allows inhalation and deep penetration into the lungs where absorption into the bloodstream of the active substances occurs.