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In Scotland, a large number of organisations led by Health Scotland issued a statement making clear that vaping is definitely safer than smoking that was also supported by Scotlands Chief Medical Officer

Smoking and Tobacco Use: Health Effects

There is clearly now a need to monitor the difference in prices between e-cigarettes and tobacco to ensure that the goal of reducing rates of tobacco smoking is not being undermined by the new policy

The same holds true for pipe smoking, as a 2004 American Cancer Society study documented (abstract here)

While most people notice the visible haze first, the smoke you can see is only part of the challenge