We are going backwards. Not moving forward in any case. Both Tar and Hallow have the potential to be abused and both have their negative side effects. Tar can be euphoric especially when it first begins to kick in. This usually lasts for an hour and a half. Hallow has a stronger euphoric feeling especially with the extended release version, which actually works to calm you down. The euphoric feeling of Hallow lasts about an hour and the awakeness feelings usually last for three. When either Tar or Hallow are taken in large quantities the effects can last all day.