Well, turpentine sounds better than the smell you'd get from some mule who sneaked it across the border in his butt.
if its administered thru the rectum. it wouldnt smell near as bad if the mule had swallowed it. Since it dont need to pass thru the intestines , colon is an empty channel very little smell alone by itself.
the smell has normally to do with the solvent they use... coke has different smells depending on the solvents, I noticed that if you buy shitty street coke the solvent smell will be stronger. But if you buy from better sources more expensive the colour of the powder will be lighter and the smell less strong.