5drive

Usually here on the vape forum when we speak of a 'clean high', it refers to vaping in the temp range where you avoid the toxins that release at higher temps and with smoking. The temp range also has an effect on the 'type' of high you get, and that's what you're referring to with using different strains. Vaping at the lower temp range gives you more of a Sativa high-stimulating, while the higher temp range will give you more of an Indica type sleepy high. So both the temp and the strain of weed will determine the 'type' of high, while only the vaping temp determines how 'clean' it is.

"Here is a quote from Hilary Black of the British Columbia Compassion Society:

"Indica and Sativa are the two main varieties of the cannabis plant used as medicine. There are many strains that are crosses of those two varieties. Within each of those varieties and crosses there are a huge number of individual strains, each with a different cannabinoid profile and effect. According to anecdotal evidence, the Indica strains are a relaxant, effective for anxiety, pain, nausea, appetite stimulation, sleep, muscle spasms and tremors, among other symptoms. The Sativa strains are more of a stimulant, effective in appetite stimulation, relieving depression, migraines, pain and nausea. We are now aware of specific strains that are effective for specific conditions and symptoms."

medicalmarihuana.ca/strains.html