[whytookay]

Sure, but if he has a track record of being wrong about X then being skeptical of future claims seems reasonable.

[Invictus0]

There's no nicotine in cannabis, so I don't see how they are at all related

[mrgoldenbrown]

If someone has a history of misrepresenting research on drug X and drug Y, it's reasonable to be skeptical of their claims about drug Z