Why and How is consuming tobacco a hindrance in achieving God?

Consumption of tobacco has been described as the most sinful act and the biggest hindrance in achieving God. Even offering tobacco to someone is highly sinful. Those who worship but also consume tobacco or alcohol can never attain God. Possibly this is why tobacco is forbidden in Sikhism and is not cosumed by Sikhs. 

Part 1: God's Punishment for Consuming Tobacco
Part 2: Why Tobacco is a Hindrance in Achieving God?
Part 3: Origin of Tobacco (तमाखू) - in God's Speech - How tobacco (तमा + खू = तमाखू) originated? What is it and How Tobacco is a Hindrance in Achieving God?
Part 4: Garibdas Maharaj Ji's Vani on Tobacco