In DSM, nicotine dependence is included under the general definition of substance dependence.  The essential feature of Substance Dependence is a cluster of cognitive, behavioral, and physiologic symptoms indicating that the individual continues use of the substance despite significant substance-related problems.
The Best Materials to Cover your Greenhouse. 1  Glass: The traditional greenhouse covering, glass is the preferred material for permanence. 2  Film Plastic: Film plastic is one sixth to one tenth of the cost per square foot of a glass covered structure.
High Quality Greenhouse Covering, Always Low Pricing. 1  Standard Clear Greenhouse Film, 6mil. 2  Thermal Anti-Condensate Greenhouse Film, 6mil. 3  Easy Ship 2' Wide Twinwall Polycarbonate. 4  Solexx XP 3.5mm, per linear foot. 5  Solar Max Reinforced Poly Film. 6  Easy Ship 2' Wide Corrugated Polycarbonate. 7  White Greenhouse Film, 6mil.