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In a new note to clients, Morgan Stanley tobacco analyst David Adelman compares the average price of a pack of cigarettes based on the minutes of work it takes to buy one

This estimate uses the Hatch-Choate equations to calculate the particle mobility diameter that represents the average mass of the measured mobility size distributions fitted with a log-normal function

The findings of these studies are clear and consistent: The risks associated with cannabis smoke and tobacco smoke are far from equal.

"Whilst it is great that smokers try to cut down -- and they should be positively encouraged to do so -- in order to get the big benefits on cardiovascular disease they need to quit completely," he said by email