![]() ![]() Disappearance of MEG from a chamber filled with crack smoke was a two-component process, one proceeding at the rate of cocaine particle removal, and the other at the desorption rate from other surfaces. ![]() The vapor pressure of MEG was higher than cocaine base, consistent with MEG coating the droplet during condensation, and with evaporation during aging or dilution. Methylecgonidine was < or = 1% of the recovered material when cocaine was vaporized off a heated wire coil, but the particles were larger (2-5 microns), and the distribution disperse. Heating cocaine base in model crack pipes produced particles of about 1 micron in diameter, regardless of the amount heated however, MEG concentration increased from < or = 2% at 10 mg per heating to as much as 5% at 30 mg per heating. Upon cooling, a condensation aerosol forms. When heated, it volatilizes and may partially pyrolyze to methylecgonidine (MEG). Crack is a form of cocaine base self-administered by smoking. ![]()
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