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.
Greenhouse Covering. Whether you're replacing existing greenhouse coverings or building a greenhouse you're sure to find the best greenhouse covering at FarmTek. Greenhouse glazing is the material that covers the greenhouse frame and the most widely used materials are polycarbonate and poly film.
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.