Withdrawal symptoms vary with the substance, but some symptoms may include increased heart rate, shaking, insomnia, fatigue, and irritability. Substance abuse is continued use of a substance in spite of school-or work-related or interpersonal problems, but the user has not gotten dependent on the substance.The individual who abuses a substance may experience legal problems and may have problems fulfilling responsibilities, such as caring for a child.ithdrawal symptoms vary with the substance, but some symptoms may include increased heart rate, shaking, insomnia, fatigue, and irritability. Substance abuse is continued use of a substance in spite of school-or work-related or interpersonal problems, but the user has not gotten dependent on the substance.
2. (Units) Also called: short ton or net ton US a unit of weight equal to 2000 pounds or 907.184 kilograms. 3. (Units) Also called: metric ton or tonne a unit of weight equal to 1000 kilograms. 4. (Units) Also called: freight ton a unit of volume or weight used for charging or measuring freight in shipping.
The 'long ton' comprises 2240 pounds,  whereas the 'short ton' comprises 2000 pounds.    The 'tonne' (spoken as, 'metric ton') is a non-SI unit,  equivalent to a mass of 1000 kg.    A mass of one tonne is equivalent to 0.984 206 (long) tons. Tons of terms   A gross ton (sometimes called the long ton) is equal to 2240 pounds. A metric ton (sometime referred to as the tonne) is 1000 kilograms, which is eq â¦ uivalent to 2205 pounds.