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Sperm Morphology: Smoking can cause abnormalities in the shape of sperm, which can affect their ability to fertilize an egg

The machines they use for analysis can detect drugs in the part-per-billion range, which is like putting a drop of dye into a semi-tanker trucks worth of water and still being able to detect it. Because the trace amount of THC found in CBD products is still the same THC chemical that found in smoking or using marijuana, this can cause a positive workplace drug test for THC

Of the remaining 46 per cent, about a fourth said they had quit smoking, the report added.

Smoking kills about 80,000 people a year, external, and is responsible for one in four of all deaths from cancer