The best replacement for sidestream is mainstream smoke.

The best alternatives to sidestream are rated as following:
★★★★★  mainstream smoke
★★★★  mainstream
★★  mainstream capnography
★★  mainstream co2
★  mainstream etco2
★  microstream
★  secondhand smoke

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Google Trends

Scale is based on the average worldwide traffic of sidestream in all years. Click on graph for more.
sidestream
mainstream smoke
mainstream